Color-tunable Emission Research Articles

Controllable Anion Exchange on Perovskite Nanocrystal Solid-State Thin Films

Colloidal mixed-halide perovskite nanocrystals (NCs) with a tunable emission color possess great potential for optoelectronic applications. However, their emission color and wavelength often change after purification and thin film deposition steps. In this work, to circumvent the emission shift issue, we report a novel method to directly tune the emission wavelength through a controllable anion exchange process on perovskite NC solid-state thin films. Specifically, it is realized by using hydrofluoroethers as the chemically benign reaction media with an organic halogen reagent. Our study also demonstrates that the phenylphosphonic halide reagent-related hydrolysis reaction is the dominant mechanism of anion exchange. Based on the diversity of the halogen reagent, our anion-exchange approach shows good universality. Finally, as a proof of concept, colorful RGB light-emitting diodes (LEDs) are fabricated, which shows the promising potential of our controllable anion-exchange strategy on perovskite NC solid-state thin films and the compatibility with optoelectronic device applications.

Multicolor Circularly Polarized Luminescence from Inorganic Crystalline Nanostructures Induced by Atomic Chirality.

Circularly polarized luminescence (CPL) is well-studied in molecular systems but has been rarely reported in pure inorganic nanoscale crystals. Herein, we develop a family of pure inorganic rare-earth nanowires with robust and color-tunable CPL emissions. The chiral rare earth nanowires possess intrinsic atomic chirality with controlled handedness that is guided by the enantiomers with molecular chirality in the synthesis. By varying luminescent ions incorporated in the crystal lattice, color-tunable CPL can be achieved and is thermally robust, preserving emission over 300 °C, distinct from existing CPL-active materials. Moreover, as a proof of concept, we demonstrate that the synthesized nanostructures can be easily dispersed in a polymer matrix to enable transparent and flexible CPL films. This study opens up a promising avenue to design robust and tunable CPL materials helpful to the understanding of inorganic chiral information and capable of further applications in novel optoelectronic devices.

Tunable luminescence and efficient energy transfer investigation of a borosilicate phosphor KBSi2O6: Bi3+, Eu3+ with hypersensitive thermal quenching

Energy transfer between Bi3+ and Eu3+ has undergone substantial research but Bi3+ and Eu3+ co-doped luminescent materials with high energy transfer efficiency for temperature sensing are rarely investigated until now. Herein, Eu3+ and Bi3+ co-doped KBSi2O6 phosphors were successfully synthesized by solid-state reaction method. The phase purity structure as well as the element distribution were carefully investigated through X-ray diffraction structural refinement and energy dispersive spectrometer analysis. The characteristic luminescence property and luminescence kinetics of KBSi2O6: Bi3+, Eu3+ were investigated. By the large spectra overlap between the emission spectrum of Bi3+ and excitation spectrum of Eu3+, the energy transfer from Bi3+ to Eu3+ can be inferred. The corresponding decrease of the emission intensity and decay time of Bi3+ in KBSi2O6: Bi3+, Eu3+ provided direct evidence for the effective energy transfer from Bi3+ to Eu3+. The interaction and energy transfer mechanism between Bi3+ and Eu3+ ions were also studied. By increasing the Eu3+ concentration in KBSi2O6: Bi3+, Eu3+, the color-tunable emission from blue to red can be realized. KBSi2O6: Bi3+, Eu3+ shows hypersensitive thermal quenching behavior and the maximum absolute sensitivity (Sa) and relative sensitivity (Sr) are determined to be 1.87 %K−1 and 2.895 %K−1, respectively. All of the above results imply that KBSi2O6: Bi3+, Eu3+ phosphor can be a color-tunable phosphor for optical temperature sensing.

Luminescent properties of lanthanide complexes and applications in security anti-counterfeiting and information encryption based on pH response

The development of advanced anti-counterfeiting strategies and materials based on rare earth luminescent materials has shown great applications in preventing serious counterfeiting forgery techniques. In this work, a series of lanthanide organic complexes [Ln3(PDC)3Bipy(H2O)3]·2H2O(Ln = Eu, Tb, EuxTb1-x, H2PDC: pyridine-3,5-dicarboxylicacid, H2Bipy: 2,2-bipyridine), were synthesized via hydrothermal method. The results of Fourier transform infrared spectra(FTIR), thermos-gravimetric analysis(TGA) and powder X-ray diffraction(XRD), illustrate that the complexes share similar structures. The complexes exhibit strong emission even with the presence of water molecules coordinated in the structure. By adjusting the Eu/Tb molar ratio of the complexes, tunable emission color from green, yellow to red was achieved. Furthermore, both the luminescence color and the intensity exhibit obvious changes when the pH of the solution (glycerol: H2O = 1:1 V/V) is varied from neutral to acid or to basicity. In addition, Eu3+ and Tb3+metal ions in the binuclear complexes respond differently to pH alteration, therefore the emission color and intensity of the binuclear complexes are tuned with pH. Based on the special pH response of the complexes, we demonstrated the potential utility of the samplesfor security anti-counterfeiting and information multiple encryption.

Polymerized Thermally Activated Delayed‐Fluorescence Small Molecules: Long‐Axis Polymerization Leads to a Nearly Concentration‐Independent Luminescence

AbstractNowadays numerous thermally activated delayed fluorescence (TADF) polymers have been developed for PLEDs to realize high device performance and tunable emission colors. However, they often possess a strong concentration dependence on their luminescence including aggregation‐caused quenching (ACQ) and aggregation‐induced emission (AIE). Herein, we first report a nearly concentration‐independent TADF polymer based on the strategy of polymerized TADF small molecules. It is found that when a donor‐acceptor‐donor (D‐A‐D) type TADF small molecule is polymerized through its long‐axis direction, the triplet state is distributed along the polymeric backbone to effectively suppress the unwanted concentration quenching. Unlike the short‐axis one with an ACQ effect, the photoluminescent quantum yield (PLQY) of the resultant long‐axis polymer remains almost unchanged with the increasing doping concentration. Accordingly, a promising external quantum efficiency (EQE) up to 20 % is successfully achieved in a whole doping control window of 5–100 wt. %.

Polymerized Thermally Activated Delayed-Fluorescence Small Molecules: Long-Axis Polymerization Leads to a Nearly Concentration-Independent Luminescence.

Nowadays numerous thermally activated delayed fluorescence (TADF) polymers have been developed for PLEDs to realize high device performance and tunable emission colors. However, they often possess a strong concentration dependence on their luminescence including aggregation-caused quenching (ACQ) and aggregation-induced emission (AIE). Herein, we first report a nearly concentration-independent TADF polymer based on the strategy of polymerized TADF small molecules. It is found that when a donor-acceptor-donor (D-A-D) type TADF small molecule is polymerized through its long-axis direction, the triplet state is distributed along the polymeric backbone to effectively suppress the unwanted concentration quenching. Unlike the short-axis one with an ACQ effect, the photoluminescent quantum yield (PLQY) of the resultant long-axis polymer remains almost unchanged with the increasing doping concentration. Accordingly, a promising external quantum efficiency (EQE) up to 20 % is successfully achieved in a whole doping control window of 5-100 wt. %.

White-light emission from yttrium iron garnet (YIG)

Single-phase phosphors that emit broadband white-light are needed for white-light-emitting diodes (wLEDs) to reach their full potential. However, it is challenging to achieve broad white-light emission from single-phase materials. Consequently, polycrystalline inorganic bulk compounds that emit white-light sans doping are rare. We report on broadband white-light emission from a well-known garnet compound, i.e., yttrium iron garnet (YIG), without activator-ion doping. Upon near-UV excitation at 370 nm, polycrystalline bulk YIG emits broadband white-light with (1931) Commission Internationale de L’Eclairage (CIE) coordinates as (0.28, 0.35) and correlated color temperature (CCT) as 8029 K. Variable excitation wavelengths ranging from 280 to 600 nm enable color-tunable emission as cyan-white-blue-green-yellow-orange-red, including near-white-light emission for a broad range of excitation from 325 to 390 nm. Moreover, a short lifetime (sub-nanosecond) is obtained, which is desirable for LED and other applications. We demonstrated the propriety of YIG as a single-phase converting phosphor for illumination by fabricating prototype wLEDs using commercial InGaN UV-LED chips (λ = 380 nm) for excitation. The CIE coordinates and CCT of prototype wLEDs were obtained as (0.34, 0.37) and 5284 K, respectively. We believe that the reported findings signify the great potential of YIG as a single-phase white-light-emitting phosphor for broadband emission, which offers a new perspective and a viable approach for the development of wLEDs.

Tunable Aggregation-induced Emission and Emission Colors of Imidazolium and Pyridinium Based Hydrazones.

Aggregation-induced emission (AIE) materials have drawn great attention for their wide applications as optical materials. The applications of AIE materials, however, are restricted by the complicated syntheses, hydrophobic properties and short emission wavelengths. Herein, an imidazolium based hydrazone (E)-1-(4-methoxyphenyl)-2-((1-methyl-1H-imidazol-2-yl)methylene)hydrazine hydrochloride (1) and a pyridinium based hydrazone (E)-1-(4-methoxyphenyl)-2-(pyridin-4-ylmethylene)hydrazine hydrochloride (2) have been synthesized. Notably, 1 and 2 in crystals show distinct green and near-infrared (NIR) fluorescence, with emission peaks at 530 and 688nm, and Stokes shifts of 176 and 308nm, respectively. After grinding the crystals to powder, the absolute fluorescence quantum yield (ΦF) of 1 is increased from 4.2% to 10.6%, and the ΦF of 2 is increased from 0.2% to 0.7%. X-ray crystallography studies together with theoretical calculations indicate that the enhanced emission of 1 arises from hydrogen bonding induced rigid network, and the fluorescence in the NIR region and large Stokes shift of 2 are attributed to its twisted molecular structure and strong push-pull effect.

Tetraphenylethene-based macrocycles: Visualized monitoring the hydrolysis of silicon-oxygen bond and their tunable luminescent properties

The preparation of silicone material is generally carried out by hydrolytic condensation, and various methods have been tried so far to study the kinetics of silicon-oxygen bond hydrolysis. However, the process and kinetics of silicon-oxygen bond hydrolysis cannot be efficiently monitored in real-time due to the limitations of traditional testing methods. In the present study, we have successfully designed and synthesized a series of circular tetraphenylethylene (TPE) derivatives connected with different lengths of the siloxanes chain. As the chain length gets longer, the restriction on phenyl rotation in TPE derivatives becomes weaker, which induced fluorescence quenching gradually at the molecular level. Hence, it provides the most direct and convincing evidence for the effect of chain lengths in the popular restricted intramolecular rotation (RIR) mechanism with aggregation-induced emission (AIE) phenomenon. The strong fluorescent molecule was used to monitor the kinetics of silicon-oxygen bond hydrolysis in real-time successfully by the AIE method with the RIR mechanism. The high sensitivity and efficiency of fluorescence provide an unparalleled “visualization” window for real-time monitoring of the kinetic control of Si-O bond hydrolysis. Furthermore, the half-life and reaction kinetic data of Si-O bond-breaking reaction by different pH are obtained to provide a reference for scientists and engineers not only in fundamental research but also in industrial production. Finally, the aggregation-induced color-tunable emission was obtained with the different aggregation forms of molecules, exhibiting a promising potential for intelligent luminescent materials.

Cu2+-Induced “Off–On–Off” Switching Luminescence of Cellulose-Based Luminescent Hydrogels

Stimuli-responsive luminescent hydrogels based on natural cellulose are emerging soft materials with potential applications because they simultaneously show unique luminescence properties, biocompatibility, biodegradability, and stimuli-responsiveness, and they particularly serve as functional biomaterials for bioimaging, biosensing, therapeutics, and so on. Herein, we provide a new method to prepare transparent, bulky, and multi-color luminescent hydrogels based on cellulose, ionic liquids, and lanthanide complexes (LnCs). Cellulose-based luminescent hydrogels were constructed first via dissolution–regeneration processes by dissolving cellulose in 1-allyl-3-methylimidazolium chloride (AmimCl) and then immersed in an aqueous solution of LnCs to fill the uniform porous structure of cellulose. The color-tunable emission colors ranging from red to green were emerged through regulating the molar ratio of Eu3+/Tb3+ in LnCs. Additionally, the presence of Cu2+ results in the luminescence “turn-off” process of resultant hydrogels by the naked eye through the photo-induced electron-transfer (PET) mechanism, including color and intensity, resulting in the selective recognition of Cu2+ ions. Moreover, the strong coordination between glutathione (GSH) and Cu2+ could destroy the PET process and restore the luminescence to “turn-on”. Therefore, cellulose-based hydrogels could be utilized as biocompatible and biodegradable “off–on–off” luminescence switches in aqueous medium.

Study on energy transfer and temperature sensing properties of Pb2+/Sm3+ co-doped Ba2MgY2(BO3)4

Researches on fluorescence intensity ratio (FIR) based temperature sensors have become more and more popular in recent years. Herein, we co-doped Pb2+ and Sm3+ into the host material Ba2MgY2(BO3)4 (BMYB) to prepare a new series of phosphors. The Pb2+ activated phosphor BMYB:0.03 Pb2+ presents a wide blue emission band centered at 416 nm under 278 nm laser excitation with internal quantum efficiency of 46%. In the presence of both Pb2+ and Sm3+, energy transfer will occur between them, resulting in tunable color emission. Besides, the phosphor has an absolute sensitivity of 0.96% K−1 at 575 K, which makes it an excellent candidate for temperature sensing. These findings suggest that prepared phosphor is a potential candidate for color tunable phosphor and temperature sensing material.

Tunable emission color and anti-thermal-quenching behaviors in niobates for high-sensitive optical thermometry

Non-contact remote optical thermometers as a significant technique have been extensively developed. However, it is still a challenge to design new Bismuth-doped phosphor materials with tunable spectra for high-sensitive optical temperature sensors. Herein, a novel YxLu1-xNbO4:Bi3+ (0 ≤ x ≤ 1.0) phosphor is constructed by the isomorphic end components LuNbO4 and YNbO4. Owing to the modification of crystal field strength around Bi3+ ions, the emission positions controllably shifted from 475 to 462 nm with the increase of Y3+ ions concentrations. Besides, systematic luminescence modifying from blue to red across the white light region could be achieved via the design of Bi3+→Eu3+ energy transfer (ET). Intriguingly, an anti-thermal-quenching behavior of Eu3+ ion originating from the ET is found in Y0.8Lu0.2NbO4:Bi3+, Eu3+ (YLNO:Bi3+, Eu3+) phosphors, while Bi3+ ion presents a great emission intensity loss with only retaining 46.8% at 383 K. Based on the disparate thermal responses, the fluorescence intensity ratio (FIR) of Eu3+ to Bi3+ demonstrates excellent thermometry properties from 303 to 503 K. The maximum absolute sensitivity (Sa) and relative sensitivity (Sr) reach 0.318 K−1 (@328 K) and 1.62%K−1 (@393 K). In addition, the thermochromic performance of the resultant phosphors could be applied to qualitatively estimate the surrounding temperature. The spectral adjustability and high-sensitive of the developed phosphors highlight their multiplicity of applications in non-contact temperature measurement and white LED.

Orthogonal Trichromatic Upconversion with High Color Purity in Core‐Shell Nanoparticles for a Full‐Color Display

AbstractMaterials with tunable emission colors has attracted increasing interest in both fundamental research and applications. As a key member of light‐emitting materials family, lanthanide doped upconversion nanoparticles (UCNPs) have been intensively demonstrated to emit light in any color upon near‐infrared excitation. However, realizing the trichromatic emission in UCNPs with a fixed composition remains a great challenge. Here, without excitation pulsed modulation and three different near‐infrared pumping, we report an experimental design to fine‐control emission in the full color gamut from core–shell‐structured UCNPs by manipulating the energy migration through dual‐channel pump scheme. We also demonstrate their potential application in full‐color display. These findings may benefit the future development of convenient and versatile optical methos for multicolor tuning and open up the possibility of constructing full‐color volumetric display systems with high spatiotemporal resolution.

Orthogonal Trichromatic Upconversion with High Color Purity in Core-Shell Nanoparticles for a Full-Color Display.

Materials with tunable emission colors has attracted increasing interest in both fundamental research and applications. As a key member of light-emitting materials family, lanthanide doped upconversion nanoparticles (UCNPs) have been intensively demonstrated to emit light in any color upon near-infrared excitation. However, realizing the trichromatic emission in UCNPs with a fixed composition remains a great challenge. Here, without excitation pulsed modulation and three different near-infrared pumping, we report an experimental design to fine-control emission in the full color gamut from core-shell-structured UCNPs by manipulating the energy migration through dual-channel pump scheme. We also demonstrate their potential application in full-color display. These findings may benefit the future development of convenient and versatile optical methos for multicolor tuning and open up the possibility of constructing full-color volumetric display systems with high spatiotemporal resolution.

Highly Efficient Purely Organic Phosphorescence Light-Emitting Diodes Employing a Donor-Acceptor Skeleton with a Phenoxaselenine Donor.

Purely organic room-temperature phosphorescence (RTP) materials generally exhibit low phosphorescence quantum yield (ϕP ) and long phosphorescence lifetime (τP ) due to the theoretically spin-forbidden triplet state. Herein, by introducing a donor-acceptor (D-A) skeleton with a phenoxaselenine donor, three nonaromatic amine donor containing compounds with high ϕP and short τP in amorphous films are developed. Besides the enhanced spin-orbit coupling (SOC) by the heavy-atom effect of selenium, the D-A skeleton which facilitates orbital angular momentum change can further boost SOC, and severe nonradiative energy dissipation is also suppressed by the rigid molecular structure. Consequently, a record-high external quantum efficiency of 19.5% are achieved for the RTP organic light-emitting diode (OLED) based on 2-(phenoxaselenin-3-yl)-4,6-diphenyl-1,3,5-triazine (PXSeDRZ). Moreover, voltage-dependent color-tunable emission and single-molecule white emission are also realized. These results shed light on the broad prospects of purely organic phosphorescence materials as highly efficient OLED emitters especially for potential charming lighting applications.

A one-dimensional organic-inorganic hybrid copper(I)-halide with broadband emission

Organic-inorganic perovskite materials have shown excellent performance and strong competitiveness in high-performance photovoltaic and optoelectronic devices. Besides the color-tunable and narrow-band emissions realized in hybrid perovskites, broadband emission from lead-halide perovskites has also attracted strong interest for applications in the next generation of solid-state lighting. Although great progress has been made in lead halide perovskites, a very important aspect that hinders their commercial exploitation is the severe lead toxicity. In this research, a lead-free copper(I)-iodine hybrid was synthesized by a solution evaporation method at room temperature. Single crystal X-ray diffraction shows that this hybrid possesses the chemical formula of C6H5CH2CH2NH3CuI2. The C6H5CH2CH2NH3CuI2 belongs to the monoclinic phase with the C2/c space group, where the edge-sharing [CuI4] tetrahedral chains are separated by organic C6H5CH2CH2NH3+ ions, exhibiting one-dimensional (1D) crystal structure. The optical band-gap of C6H5CH2CH2NH3CuI2 was determined to be 4.02 eV. The photoluminescence (PL) spectrum shows a broadband emission ranging from 380 nm to 780 nm and peaks at 542 nm together with a small peak at 336 nm, which can be attributed to the emission of self-trapped exciton (STE) and free exciton (FE), respectively. The large Stokes shift of 230 nm between the PL and photoluminescence excitation (PLE) as well as the broad emission was ascribed to the Jahn–Teller lattice distortion of [CuI4] tetrahedra. The reduced 1D characteristic facilitates the tetrahedral distortion. PL decay analysis shows that the average lifetime of STE is about 66.9 ns? Temperature and time-dependent PL measurements show that the normal working temperature of this luminescent material should be no higher than 100 °C. Theoretical calculations were performed to better understand this compound. The successful synthesis and preliminary optical investigations on C6H5CH2CH2NH3CuI2 can be of great significance for offering more environmental-benign options in both solid-state lighting and other perovskite optoelectronic devices.

Emission colour tuning in KLnF4:Yb3+,Er3+/Ho3+ phosphor

KLnF4:Yb3+,Er3+/Ho3+ (Ln = Y, Yb, Gd) phosphors were prepared by solid-state reaction technique. For each of the Yb3+/Er3+ and Yb3+/Ho3+ co-doped phosphors independently, phase confirmation and morphological examination were accomplished using the X-ray diffraction technique and scanning electron microscope analysis. X-ray photoelectron spectroscopy analysis shows the charge state and existence of lanthanides and dopants. Upconversion luminescence emissions of green and red colour were detected for the synthesized phosphors. The changes in the upconverted emission intensities and colour output pertaining to the change of the lanthanide host matrix along with dopants were investigated for the prepared phosphors. In the upconversion luminescence, erbium-doped samples exhibit a predominance of red emission while holmium-doped samples display a prevalence of green emission. The rare-earth Er/Ho doped KYbF4 shows strong red emission compared to other hosts. KYF4:Yb,Er/Ho exhibits relatively significant green upconversion emissions, while Yb,Er-doped KGdF4 host displays a 10-fold increase in green/red emission ratio with an increase in the input power of 20–780 mW. Downshifting photoluminescence studies and decay curve analysis were carried out using UV light excitation for the developed phosphors. A higher lifetime of 2.2 ms was measured for the downshifting red emission in the Ho doped KYbF4 sample. This study suggests a potential for colour tunability in the upconversion and downshifting emissions through host modifications to the fluoride phosphor.

Heteroaryl-Substituted Bis-Anils: Aggregation-Induced Emission (AIE) Derivatives with Tunable ESIPT Emission Color and pH Sensitivity.

The two-step synthesis, structural, and photophysical properties of a series of heteroaryl-substituted bis-anil derivatives presenting aggregation-induced emission (AIE) coupled with an excited-state intramolecular proton transfer (ESIPT) process is described. The fluorescence color of the aggregates can be fine tuned by changing the electronic nature of the peripheral substitution, leading to a wide range of emission wavelengths (from green to the near infra-red). Moreover, upon introduction of strong electron-withdrawing groups such as cyano (CN), a competition between ESIPT and deprotonation is observed leading to the emission of the anionic species at low water percentage. This observation led to the synthesis of an additional mixed AIE fluorophore, functionalized by methoxy groups on one side and cyano groups on the other side. Upon addition of water, this dye displays first anionic emission, followed by typical AIE/ESIPT red fluorescence upon formation of the aggregates. TD-DFT calculations on selected AIE dyes were performed to rationalize the nature of the emissive transitions in these derivatives.

Energy transfer and color-tunable emission in trivalent terbium/europium doped multi-component borosilicate glasses for white light-emitting diodes under ultraviolet excitation

Multi-component sodium borosilicate glasses incorporated with trivalent terbium and europium ions in single and dual combinations via melt-quench technique were synthesized. Glasses doped with terbium and europium displayed intense green and red colors, respectively. The addition of various contents of europium ions to a pre-optimized content of 1.0 mol% terbium resulted in efficient energy transfer. The process of energy transfer was analyzed by studying the overlap of emission and absorption spectra, luminescence properties, the decay of donor (terbium) emissions, the energy level scheme and energy transfer parameters (η and P) in the terbium/europium codoped glasses. Emission spectra and lifetimes of terbium (sensitizer) are decreased with the rise of europium content at 351 nm excitation due to sensitization of europium by terbium. The energy transfer between these ions is analyzed through Dexter's theoretical model, Reisfeld's approximation, and Inokuti-Hirayama models, which confirm that the non-radiative energy transfer from terbium to europium is predominantly governed by dipole-dipole interaction. The chromaticity coordinates are presented to comprehend the color tenability from green to red via yellow due to the co-doping of terbium to europium, to confer the suitability of this combination for achieving solid-state/ indoor lighting applications.

Interstitial Zinc Boosted Light Tunability, Afterglow, and Ultrabright White Emission in Zinc Germanate (Zn2GeO4)

To reduce the burden of solid-state lighting and phosphor-converted light-emitting diode technologies on rare earth (RE) and avoid their potential supply risks, we have developed a RE-free Zn2GeO4 (ZGeO) microcrystalline phosphor. It was synthesized by a simple and scalable solid-state reaction of ZnO and GeO2 at 1200 °C. High-temperature synthesized ZGeO demonstrated color tunable emission from bluish-white to green on changing the excitation wavelength from 265 to 335 nm with a photoluminescence quantum yield of 42 and 9%, respectively. They could also convert highly energetic X-ray to bluish-green light emission. First-principles calculations showed that bluish-white and green light emissions are linked to zinc interstitials present, respectively, in zinc (Zni2) and zinc–germanium rings (Zni1). These defects generated in large numbers via high-temperature annealing along with antisites boosted the generation of trapping centers leading to dual persistent luminescence (PerL) of white and green light for more than 60 min as well as exhibited radioluminescence. Luminescent ink based on ZGeO was fabricated and successfully tested for anticounterfeiting applications. An extra effort has been vested on making this solid-state processed ZGeO dispersible in water-soluble deep eutectic solvent which could be a game changer for its marketability. This material has great potential to become an efficient RE and dopant-free phosphor synthesized by a simple, scalable, and cost-efficient route for applications in solid-state lighting, display, and anticounterfeiting, having multifunctionalities such as PerL, tunability, and RL.