Standard NTSC Research Articles

New europium complexes and their use in red light-emitting diodes and vapoluminescent sensors

Three novel trivalent europium [Eu(III)] complexes – Eu(DBM)3Phen-Ph-Ph, Eu(DBM)3Phen-mCF3-Ph, and Eu(DBM)3Phen-pCF3-Ph – were designed, synthesized, and characterized using various spectroscopic methods. Then their photophysical characteristics were investigated. The Eu complexes in the solid phase showed a pure red emission (due to the electric dipole transitions of the Eu3+ ion). In a solution, they had multiple emissions due to their ligand contribution. The solvatochromism studies revealed that the Eu(III) complexes in the methanol and DMSO solutions had both metal ion and ligand emissions with similar intensities, which yielded a white emission. Of all the Eu(III) complexes, Eu(DBM)3Phen-mCF3-Ph showed the best quantum yield. In addition, the fluorinated mCF3 ligand had an unusually high lifetime value. Its remarkable linear decrease in luminescence intensity with increasing temperature opens a new window for its use as a sensitive temperature sensor at the 30–80°C range. The CIE color coordinates of the fabricated red LEDs (InGaN) are very close to the standard NTSC CIE color coordinates for bright red emissions, and the color purity as well as the LER values of the fabricated red LEDs are also very good. The Eu(III) complexes exhibited on-off photoluminescence switching via the vapoluminescent process and responded best to the acid-base (HCl-NH3) vapors. All these features suggest that the synthesized Eu(III) complexes are efficient candidates for red-emitting LEDs and vapoluminescent sensors. Organic chromophores, which are phenanthro-imidazole ligands based on fluorinated moieties coordinated with Eu(III) metal ions, very efficiently facilitate energy transfer from the ligand to the Eu(III) ion. The CIE color coordinates of the complexes showed a bright pure red emission, with x = 0.66 and y = 0.33 (612 nm). The fabricated light-emitting diode (LED) showed superior color quality and the complexes showed on-off-on luminescence behavior after exposure to the acid-base vapors.

Polycarbonate light guide plates with embedded quantum dots fabricated by large-scale injection moulding for wide colour gamut displays

A fabrication process of polycarbonate (PC) light guide plate (LGP) incorporating fluorescent quantum dots (QDs) is presented in this study. QD-PC composite pellets with dimension of 500 to 2500 μm were first prepared from a mixture of polyethylene-treated QDs and PC resin powder, followed by injection moulding to form a QD-LGP between 340 and 295 °C. The fabricated QD-LGPs demonstrated dual functions of light guiding and QD colour conversion, which is conventionally provided by a LGP covered with an additional QD diffuser film. By directly embedding QDs into a LGP, it was found that a rather low cadmium content around 41 ppm was sufficient to provide a uniform backlighting for a liquid-crystal display with a colour gamut of ~115% NTSC standard.

CH3NH3Pb1–xCoxBr3–2xCl2x Perovskite Quantum Dots for Wide-Color Backlighting

In recent years, perovskite quantum dots (PQDs) with the incorporation of transition-metal ions for reducing toxicity and enhancing stability have been in a research hotspot. However, the PQDs containing transition-metal ions are quite unstable and display low photoluminescence quantum yields (PLQYs), owing to the existence of defects. Herein, we have endeavored to introduce simultaneous cation and anion exchange with cobalt and chloride ions into the host CH3NH3Pb1–xCoxBr3–2xCl2x PQDs followed by matrix encapsulation via poly(methyl methacrylate) (PMMA) as a favorable approach to stabilize PQDs with improved PLQY. We have utilized cobalt chloride as the precursor for doping ions. The emission wavelength can be regulated from green to cyan color with the increase in doping concentration without negotiating on color quality, which is believed to be the modification of band gap and corresponding electron density estimated from the density functional theory. A high PLQY of 95% is observed even after the incorporation of cobalt and chloride ions into host PQDs. We demonstrate white light-emitting diode (LED) prototypes for backlight applications using a PQDs/PMMA composite on a blue LED chip, which exhibits excellent stability toward an ambient and robust atmosphere and provides a wide-color gamut of 124% of the NTSC standard. This research paves a way for the research community to synthesize highly efficient, color-tunable PQDs for wide-color backlighting applications.

A novel in-situ process for high performance blue CsPbBr3 perovskite quantum dots via Cs ion-exchange in Sodium Titanium Silicate

Inorganic perovskite quantum dots (QDs) have attracted extensive attention from researchers in recent years, because of their good prospects in micro-LED for next generation lighting and display. However, the research on high quality and stable inorganic perovskite blue QDs is relatively backward, which limits its further applications in micro-LED. In the present work, crystalline silicotitanate (CST) is used as matrix and synthesized by hydrothermal method, then, Cs+ ion replaces Na+ ion in the tunnel in c-axis dimension of CST matrix by ion exchange, and finally, the CsPbBr3 QDs are in situ anchored on the Cs+ ion in the tunnel. The sizes of the as prepared CsPbBr3 QDs are determined to be mostly less than 4 nm, which guarantees the as prepared CST: CsPbBr3 QDs to have a brilliant blue emission peak at 463 nm with a narrow FWHM of less than 20 nm, and it can be excited by a broad n-UV light range from 300 to 400 nm and peak at 365 nm. A photoluminescent quantum yield of 88.34% is achieved. Furthermore, the as prepared CST: CsPbBr3 QDs is demonstrated to have a good air and thermal stability with an average PL lifetime of 112.00 ns? The color gamut of CST: CsPbBr3 QDS together with the commercial green (Sr, Ba)2SiO4: Eu2+ and red (Sr, Ca)AlSiN3: Eu2+ phosphors is calculated to be 114.12% of the NTSC standard. Therefore, the present pure blue CST: CsPbBr3 QDs can be a potential backlight source for display devices.

Ravishing blue emission from Ce3+ activated lithium borate glasses for photonic applications

Lithium borate glasses activated with specific concentrations of Ce3+ ions have been processed by melt quenching technique. X-ray diffraction and SEM with EDAX carried out structural and surface morphology with elemental confirmation respectively. The nebulous nature of glassy matrices have been affirmatively confirmed by XRD and it was corroborated with SEM analysis. A distinguished absorption band is noticed in the ultraviolet region and the photoluminescence spectra displays a broad and intense blue emission band in the region from 395 nm to 570 nm which is centered at 447 nm (5d→4f) by exciting with 350 nm in Ce3+: LBZ glassy matrices. The dazzling blue emission intensity was significantly ameliorated by improving the addition of Ce3+ ion concentration in the glass matrix. The blue emission intensity has been found to be decreased at higher concentrations due to concentration quenching and the optimal concentration of Ce3+ ions is estimated to be 0.5 mol%. The fluorescence decay time has been evaluated as 0.86 ms from the decay profile of 0.5 mol% Ce3+: LBZ glass. Chromaticity coordinates were determined from the luminescence spectra, which are found to be falls in the bright blue region. The obtained blue emission CIE coordinates are close to standard EBU and NTSC coordinates for blue illumination. In view of these spectral features, 0.5 mol% Ce3+: LBZ glass could be recommended as promising candidate for the applications of blue emissive photonic devices.

Synthesis and photoluminescence properties of Eu3+ doped Sr5Nb4O15 red-emitting phosphors for white LEDs

In this paper, a novel red-emitting material based on Eu3+ ion activated Sr5Nb4O15 was synthesized via a solid-state reaction method. The XRD patterns indicated that the sample, heated at 1300℃ for 6 h, could obtain pure phase with high crystallinity. The phosphors displayed irregular shapes with an averages diameter of approximately 0.66 μm. Excited upon 393 nm, the phosphors exhibited bright red emission peak at 613 nm, being assigned to the electric dipole 5D0-7F2transition of Eu3+ ions. In addition, the effect of Eu3+ doping concentration on the emission intensity was investigated in detail. The optimal doping concentration for the best PL performance was experimentally determined to be 15 mol%, beyond which the concentration quenching behavior occurred. The critical distance was calculated to be about 16 Å, revealing that the process of energy transfer between Eu3+ ions in Sr5Nb4O15 host was dominated by multipolar interaction. The chromaticity coordinates of the Sr4.85Nb4O15: 0.15Eu3+ phosphor were calculated to be (0.6354, 0.3642), closing to the standard NTSC values (0.67, 0.33). Thus, the Sr5Nb4O15: Eu3+ red phosphors could be potential candidates for the application in solid-state White LEDs, combined with near ultraviolet chip.

Optical absorption intensity analysis using Judd-Ofelt theory and photoluminescence investigation for red-emitting Eu3+: TiO2 nanoparticles

Nanoparticles of Eu3+ doped TiO2 have been synthesized by the hydrothermal technique. Structural, morphological, and luminescence characteristics of the nanophosphors were examined in detail. The powder X-ray diffraction pattern reveals that below 9 mol% concentration of Eu3+ doped TiO2, all samples show the anatase phase with tetragonal structure.The photoluminescence studies showed that as-synthesized samples exhibited excellent luminescence property due to the conversion of energy from the host matrix to europium ions. The Judd− Ofelt (JO) analysis was used to study the such spectroscopic parameters as branching ratio, emission cross-section, gain bandwidth, and gain coefficient for all the samples. The concentration quenching was seen and this may be due to the nonradiative energy transfer by the multipole-multipole mechanism. The emission spectra were recorded under the excitation at 376 nm revealed enhanced asymmetric ratios. That confirms the improved color purity (97%) for all the samples. The color coordinates of 1–11 mol% Eu3+ doped TiO2 samples were calculated by Commission international del’ Eclirage (CIE) algorithm and they and are in good agreement with standard NTSC coordinates (0.62, 0.37) of optimized concentration of Eu3+ doped TiO2 sample. Thus, the samples are promising candidates for such applications as lighting, displays, and laser systems.

Red emitting CaTiO3: Pr3+ nanophosphors for rapid identification of high contrast latent fingerprints

Red emitting (~612 nm) CaTiO3:Pr3+ long afterglow nanocrystals with a persistence time ~20 min (dark adapted human eyes) have been synthesised for developing high contrast latent fingerprints using the sol-gel process. Due to the persistent emission, CaTiO3:Pr3+ nanophosphor does not require a continuous source for excitation, thereby eliminating the background information even from multi-colour substrates, resulting in a high signal to noise ratio. As a consequence of which, minute features of level- I, II and III can be clearly studied in high contrast fingerprints. Considerable blue shift (~20 nm) was recorded in photoluminescence excitation due to the quantum confinement properties of CaTiO3:Pr3+ nanocrystals. Powder x-ray diffraction confirms the formation of a single phase orthorhombic structure of CaTiO3:Pr3+ with average crystallite size ~40 nm. Spectral parameters indicate a very high color purity of 99% with CIE coordinates (0.62, 0.37) which are very close to NTSC standards for an ideal red-emission. Transmission electron microscopy studies confirm the formation of spherical particles with narrow size distribution which makes them suitable to combine with fingerprint development methods such as powder dusting and cyanoacrylate fuming methods.

Colloidal Synthesis of Ternary Copper Halide Nanocrystals for High-Efficiency Deep-Blue Light-Emitting Diodes with a Half-Lifetime above 100 h.

Currently, the blue perovskite light-emitting diodes (PeLEDs) suffer from a compromise in lead toxicity and poor operation stability, and most previous studies have struggled to meet the crucial blue NTSC standard. In this study, electrically driven deep-blue LEDs (∼445 nm) based on zero-dimensional (0D) Cs3Cu2I5 nanocrystals (NCs) were demonstrated with the color coordinates of (0.16, 0.07) and a high external quantum efficiency of ∼1.12%, comparable with the best-performing blue LEDs based on lead-halide perovskites. Encouraged by the remarkable stability of Cs3Cu2I5 NCs against heat and environmental oxygen/moisture, the proposed device was operated in a continuous current mode for 170 h, producing a record half-lifetime of ∼108 h. The device stability was further verified by an aggressive thermal cycling test (300-360-300 K) and a 35-day storage test. Together with the eco-friendly features and facile colloidal synthesis technique, the 0D Cs3Cu2I5 NCs can be therefore regarded as a promising candidate for deep-blue LEDs applications.

High purity blue photoluminescence in thulium activated α-Na3Y(VO4)2 nanocrystals via host sensitization

A novel blue emitting glaserite type α-Na3Y(VO4)2 nanocrystals substituted with the trivalent thulium ions were synthesized for the first time via citrate based solution combustion method. The monoclinic structure and well dispersed spherical morphology of the synthesized nanocrystals were confirmed by XRD, TEM, HRTEM and SAED analysis. Host lattice emits broad band blue color and it originates from the VO43−. The presence of a very intense and broad charge transfer band in excitation spectra of α-Na3Y(VO4)2:Tm3+ monitored under 474 nm demonstrates the efficient energy transfer from VO43− to Tm3+ in α-Na3Y(VO4)2:Tm3+. Photoluminescence studies of Tm3+ activated α-Na3Y(VO4)2 samples show blue emission under excitation wavelength 310 nm. The optimal doping concentration of Tm3+ ions in α-Na3Y(VO4)2 phosphors is found to be around 1.5 mol % and the major mechanism for concentration quenching is the dipole - dipole interaction. The quantum yield for the sample with optimum concentration is measured to be 18.16%. The CIE chromaticity color coordinates were calculated and it is very much closer to the NTSC standards with high color purity. The lifetime of the thulium characteristic blue emission is found to be in the order of 0.1 ms. All the results clearly indicate that pure α-Na3Y(VO4)2 as well as rare earth Tm3+ activated α-Na3Y(VO4)2 nanocrystals can be used as potential candidates in the field of optoelectronics, especially for the fabrication of near-UV based white LEDs, bio-imaging and labeling etc.

SDR 플랫폼을 이용한 NTSC 표준 기반의 TV 송신기 구현

SDR 플랫폼을 이용한 NTSC 표준 기반의 TV 송신기 구현

Monovalent ions co-doped SrTiO3:Pr3+ nanostructures for the visualization of latent fingerprints and can be red component for solid state devices

Structural and luminescence properties of SrTiO3: Pr3+: A+ (A+: Li, Na, K) nanophosphors were synthesized by simple sonochemical route. Prepared products were well-characterized for their optical and structural properties. Surface morphology of the prepared samples were studied with the influential parameters such as surfactant concentration, sonication time, temperature, pH and compared the effect with normal mechanical stirring. Morphology was highly dependent on the experimental parameters. The predicted growth mechanism to obtain superstructures of the samples prepared by sonochemical method was discussed. Photoluminescence (PL) studies exhibit characteristic emission peaks of Pr3+ ions in the range 500–750 nm. The highest PL intensity was obtained for 5 mol% of Pr3+ doped samples. Further, co-doping with Li+, Na+ and K+ ions into Pr3+ activated SrTiO3 phosphor led to an enhancement in luminescence intensity by reducing the parity restriction of electric dipole transitions. As a consequence of suitable local distortion of the crystal field surrounding to the Pr3+ activator ions. The maximum PL intensity was observed for Li+ (1 wt%) co-doped SrTiO3:Pr3+ (5 mol%) samples. Furthermore, Li+ ion was the best charge compensator, because of it reduced the defects emission and also increased the emission intensity of Pr3+ significantly. Prepared phosphors exhibit short lifetime, good quantum efficiency; excellent color purity which is near to the NTSC standards. Prepared fluorescent powders were used as a dusting powder for the rapid visualization of latent fingerprints under UV light of 254 nm. From the reported results it is evident that the optimized prepared samples are suitable for solid state lighting and advanced forensic investigation applications.

Enabling a 6.5% External Quantum Efficiency Deep-Blue Organic Light-Emitting Diode with a Solution-Processable Carbazole-Based Emitter

Highly efficient deep-blue emission is crucial to realize energy-efficient and high-quality display and solid-state lighting applications. A solution-processable deep-blue emitter is essential for producing cost-effective large-area devices via roll-to-roll fabrication. Here, we demonstrate a highly efficient solution-processable deep-blue organic light-emitting diode by utilizing a carbazole-based fluorescent emitter 6-((9,9-dibutyl-7-((7-cyano-9-(2-ethylhexyl)-9H-carbazol-2-yl)ethynyl)-9H-fluoren-2-yl)ethynyl)-9-(2-ethylhexyl)-9H-carbazole-2-carbonitrile (JV55). The resultant device showed a maximum external quantum efficiency (EQE) of 6.5% and an EQE of 5.5% at 100 cd/m2 with CIE coordinates of (0.16, 0.06). The optimized device showed a maximum EQE of 6.5%. Additionally, the deep-blue emission also realized a 101% color saturation according to the NTSC standard. The high efficiency may be attributed to engineering appropriate device architecture and enabling balanced carrier injection, effective host-...

Spectroscopic studies of strong red emitting Sr2SiO4:Eu3+ nanophosphors with high color purity for application in WLED using Judd-Ofelt theory and TL glow curve analysis

Un-doped and Eu3+ doped Sr2SiO4 nanophosphors were synthesized by self-propagating solution combustion synthesis and are characterised with different material and optical characterisations. X-ray diffraction (XRD) confirmed orthorhombic phase, transmission electron microscopy (TEM) revealed the nanophosphors with irregular shape but crystalline in nature. The photoluminescence (PL) excitation, emission spectra and lifetime are thoroughly discussed. The emission spectra due to the excitation under 393 nm showed better asymmetric ratios than the 260 nm excitation ensuring better color purity of 97%. The comparative investigations using commission international del’Eclirage (CIE) diagram also established that the color purity of 393 nm excitation is superior with CIE co-ordinates (0.66, 0.34) and is close to NTSC standards. The Judd Ofelt (JO) intensity parameters (Ω2andΩ4) were obtained from PL emission spectrum and the JO parameters followed the trend Ω2>Ω4 for all Eu3+ concentration. Asymmetric ratios and JO analysis both indicated that the crystal field is non-centrosymmetric in nature. The radiative properties such as branching ratios, emission cross section, optical gain and gain bandwidth of optimised concentration are calculated. Photoluminescence lifetimes exhibited bi-exponential nature and showed higher lifetime for 393 nm excitation. Furthermore, the quenching due to non radiative energy transfer mechanism is dominated by multipole-multipole interaction. All these optical characterisations supported the fact that the nanophosphors excited at 393 nm have better pertinence towards display, laser and lighting application. Thermoluminescence (TL) studies of the nanophosphors were carried out. The kinetic parameters are calculated using general order kinetics and are verified by computerised glow curve de-convolution (CGCD). TL emission spectra and contour plots were analysed that further confirmed that the emission resembled the same as PL emission spectra.

Efficient Blue and White Perovskite Light-Emitting Diodes via Manganese Doping

Summary Despite heavy research, blue perovskite nanocrystal LEDs have struggled to match the high efficiencies of their red and green cousins, particularly at wavelengths blue enough to meet the NTSC blue standard. One of the most critical problems is the low photoluminescence yield of the nanocrystals in thin films. Recently, manganese doping has been shown to increase the photoluminescence yield of the perovskite even as a decay pathway to a long-lived emissive state on the manganese ion is introduced. Here, we employ a two-step synthetic approach to carefully tune the manganese doping to increase the blue photoluminescence while preventing significant manganese emission, allowing for blue perovskite LEDs with quantum efficiencies over 2% that meet the NTSC standard. Manganese doping increases the photoluminescence yield and lifetime, reduces trap states, and makes the dots more monodisperse, reducing the emission bandwidth. Finally, we utilize perovskite nanocrystal downconverters to build an all-perovskite white LED.

SiO2@LaOF:Eu3+ core-shell functional nanomaterials for sensitive visualization of latent fingerprints and WLED applications

For the first time, intense red color composite of SiO2@LaOF:Eu3+ core-shell nanostructures (NS) were fabricated via facile solvothermal method followed by thermal treatment. The obtained core–shell particles display better spherical shape and non-agglomeration with a narrow size distribution. Photoluminescence (PL) emission spectra exhibits intense peaks at ∼593 nm, 611 nm, 650 nm corresponds to 5D0 → 7FJ (J = 0, 1 and 2) Eu3+ transitions respectively. The spectral intensity parameters and Eu-O ligand behaviors are estimated by means of Judd-Ofelt (J-O) theory. CIE co-ordinates are found to be (x = 0.63, y = 0.36) which is very close to standard NTSC values (x = 0.67, y = 0.33). CCT value is ∼3475 K which is less than 5000 K, as a result this phosphor is suitable for warm light emitting diodes. The optimized core-shell SiO2 (coat III)@LaOF:Eu3+ (5 mol%) was used as a fluorescent labeling marker for the visualization of latent fingerprints on both porous and non-porous surfaces. Obtained fingerprints are highly sensitive and selective also no background hindrance which enables level-I to level-III fingerprint ridge characteristics. Observed results indicate that the significant improvement in luminescence of coreshell NS can be explored as a sensitive functional nanopowder for advanced forensic and solid state lightning applications.

Structural and photoluminescence behavior of thermally stable Eu3+activated CaWO4 nanophosphors via Li+ incorporation

We have studied the structural and photo physical analogue of Eu3+ activated CaWO4 nanophosphors via Lithium (Li+ = 2, 5 7 and 10 at.%) ion incorporation. As-prepared (APS) samples were annealed at 900 °C to eliminate unwanted organic moieties present in the sample and to improve crystallinity. The samples are characterized employing X-ray diffraction (XRD), Fourier transform IR spectroscopy (FTIR), UV-VIS spectroscopy, photoluminescence studies and lifetime decay studies. FTIR features an absorption band at ∼832 cm−1, which correspond to its antisymmetric vibrations into OWO band in the WO42− tetrahedron. CaWO4 having the scheelite type structure with C4h point group and I41/a space group. The surface morphology of the samples are studied with Scanning Electron Microscopy (SEM). Lithium Co-doped CaWO4:Eu3+ nanoparticles show red luminescence because of strong host contribution and different energy transfer rates from host to Eu3+ ions under 266 nm excitations. Lithium ion enhances the crystallinity and radiative transition rate thus results in higher emissive property. Calculated CIE co-ordinates of these Li+ doped 900 °C annealed samples under 266 nm excitation is x = 0.65 & y = 0.34, which are closer to the standard of NTSC (x = 0.67 & y = 0.33). This material may be potential candidates for white light emitting diodes.

Quantum dots transparent display (QDs-TPD) using a liquid QDs layer and N2 barrier discharge

Quantum dots transparent display (QDs-TPD) was realized using a liquid QDs layer and N2 barrier discharge panel. In the N2 discharge, the 2nd+ lines of N2 in the range of 300 - 400 nm (C3Πu – B3Πg), and the 1st- lines of N2+ at 391.4 and 427.8 nm (B2Σu+ - X2 Σg+) were mainly observed, while the visible emission lines were rarely observed. This implies the N2 discharge is suitable for the excitation source of the QDs, due to the strong ultra-violet radiations and the weak visible emissions. The emission centers for red, green, and blue color in QDs-TPD were positioned at 452, 540, and 638 nm, respectively, and the N2 emission peaks were seldom observed in the visible region. The transmittance of QDs-TPD was approximately 40% in the visible region and the luminescence was about 70 cd/m2. The CIE (x, y) coordinates of red, green, and blue colors were (0.670, 0.309), (0.378, 0.640), and (0.183, 0.118), respectively, and the color gamut was 71% of a NTSC standard. Thus, the QDs-TPD is expected as a way for realizing the TPD, due to its good transparency, excellent visibility, wide viewing-angle, aesthetical design, low cost production, and good scalability to large sizes.

Room-Temperature Synthesis of Widely Tunable Formamidinium Lead Halide Perovskite Nanocrystals

Colloidal perovskite nanocrystals based on formamidinium lead halide (FAPbX3) have been synthesized by the ligand-assisted reprecipitation method using PbX2–dimethyl sulfoxide complexes as precursors at room temperature. Well-defined cubic-shaped FAPbX3 nanocrystals have been obtained with a size d of ∼10 nm. The synthesized FAPbX3 nanocrystals show bright photoluminescence with a high photoluminescence quantum yield (75% for FAPbBr3). The lifetimes of FAPbBr3 nanocrystals were measured for the samples isolated at several different centrifugal speeds. The photoluminescence can be tuned from the blue to near-infrared region (λpeak = 408–784 nm) by changing either the amount of oleylamine or the composition of X. The color expression range is 135% of the NTSC standard. The bandwidth of the photoluminescence spectra of FAPbX3 nanocrystals is narrow (full width at half-maximum of 18–48 nm). FAPbX3 nanocrystals show thermal stability that is better than that of MAPbBr3 nanocrystals.

Novel and highly efficient red luminescent sensor based SiO2@Y2O3:Eu3+, M+ (M+ = Li, Na, K) composite core–shell fluorescent markers for latent fingerprint recognition, security ink and solid state lightning applications

Facile solution combustion route was used to prepare the optimized composite core shell SiO2@Y2O3:Eu3+, Li+ fluorescent nanopowders (NPs) with superior fluorescence intensity under UV light. Powder dusting technique was used for the visualization of latent fingerprints (LFPs) on different porous and non-porous surfaces. The results display that the amorphous SiO2 microspheres were covered by crystalline Y2O3:Eu3+, Li+ NPs, resulting in spherical core-shell structure. The phosphors exhibit intense pure strong red emission corresponding to characteristic Eu3+ ions 5D0→ 7F2 transitions under NUV excitation. The CIE co-ordinates were found to be (x=0.63, y=0.36) which is very close to standard NTSC values (x=0.67, y=0.33). Judd-Ofelt theory was used to estimate the intensity parameters (Ω2 and Ω4) as well as radiative properties. The CCT value was∼3475K which was less than 5000K, as a result the phosphor was highly useful in warm light emitting diodes. Thus, results presented confirms that the developed method was simple, fast and optimized phosphor was effectively used for multifunctional applications namely luminescent sensor for visualization of LFPs, solid state lightning and security ink applications.