Energy Transfer Probability Research Articles

Exploring the intermolecular interactions and contrasting binding of flufenamic acid with hemoglobin and lysozyme: A biophysical and docking insight

The intermolecular interaction of flufenamic acid (Hfluf) with two model proteins i.e., hemoglobin and lysozyme was explored using fluorescence, UV–vis, circular dichroism, DLS, and molecular docking techniques. The corroborative spectroscopic techniques suggested efficient binding of Hfluf to both the proteins. The S-V plot in Hb-Hfluf system showed positive deviation highlighting the presence of both static and dynamic quenching. Hence, ground state complex model and sphere of action quenching model were used for the study. In Lyz-Hfluf system, a linear S-V plot was obtained indicating the presence of a single quenching mechanism. FRET study suggested a high probability of energy transfer from Hb/Lyz to Hfluf. Our thermodynamic results revealed that binding reaction in both the systems was exothermic and spontaneous. The UV–vis spectroscopy demonstrated that the binding of Hfluf affected the globin, Soret and oxy-bands of Hb along with globin band and polypeptide backbone of Lyz. CD spectra revealed the enhancement of ɑ-helicity in Lyz and decrease in case of Hb whereas the Rh values of proteins from DLS experiment corroborated the CD findings. 3-D fluorescence spectra highlighted the conformational changes upon binding whereas docking studies predicted the active binding site of both the proteins as the binding site of Hfluf.

Theoretical Determination of Energy Transfer Processes and Influence of Symmetry in Lanthanide(III) Complexes: Methodological Considerations

This work presents a theoretical protocol to analyze the symmetry effect on the allowed character of the transitions and to estimate the probability of energy transfer in lanthanide(III) complexes. For this purpose, a complete study was performed based on the multireference CASSCF/PT2 technique along with TDDFT, to build the energy level diagrams and determine the spectral overlap integrals, respectively. This approach was applied on a series of LnIII complexes, viz. [LnCl3(DMF)2(Dpq)]/[Ln(NO3)3(DMF)2(Dpq)], where Ln = SmIII, TbIII, ErIII/EuIII, NdIII and dpq = dipyridoquinoxaline, synthesized and characterized by Patra et al. ( Dalton Trans. 2015 , 44 ( 46 ), 19844 - 19855 ; CrystEngComm 2016 , 18 ( 23 ), 4313 - 4322 ; Inorg. Chim. Acta 2016 , 451 , 73 - 81 ). A fragmentation scheme was applied where both the ligand and the lanthanide fragments were treated separately but at the same level of theory. The symmetry analysis only partially reproduced the expected results, and a more detailed analysis of the crystal field became necessary. On the other hand, the most probable energy transfer pathways that take place in the complexes were elucidated from the energy gaps between the ligand-localized triplet state and the emitting levels of the lanthanide fragments. These gaps, which are related to the energy transfer rate, properly reproduced the trend reported experimentally for the best and worst yields. Finally, the spectral overlap integral was calculated from the emission spectra of the dpq ligand and the absorption spectra of the lanthanide fragment. The obtained values are in good agreement with the quantum yields calculated for the systems. The most remarkable aspect of this protocol was its ability to explain the emission and nonemission of the studied compounds.

Energy transfer driven tunable emission of Tb/Eu co-doped lanthanum molybdate nanophosphors

Tb3+/Eu3+ co-doped lanthanum molybdate nanophosphors were synthesized by conventional co-precipitation method. The Powder X-ray diffractogram revealed the formation of highly crystalline tetragonal nanocrystals with space group I41/a and the detailed analysis of the small variation of lattice parameters with Tb/Eu co-doping on the host lattice were carried out based on the ionic radii of the dopants. The FTIR spectra is employed to identify the fundamental vibrational modes in La2-x-y (MoO4)3:xTb, yEu nanocrystals. The formation of nanocrystals by oriented attachment was recognized from the HR TEM images and the d-spacing calculated was in accordance with that corresponding to highest intensity diffraction peak in the XRD patterns. The constituent elements present in the samples were identified with the aid of EDAX and elemental mapping analysis. The broad Mo6+- O2− CTB and the sharp excitation peaks of Tb and Eu identified from the UV–Vis absorption spectra facilitates the suitability of exciting the phosphors effectively over NUV and visible region of the spectra. The possibility of energy transfer from host to Tb3+/Eu3+ ions and from Tb3+ to Eu3+ ions were confirmed from the PL excitation spectra monitoring 5D0→7F2 transition of Eu3+ ions around 615 nm. The correlated analysis of PL emission spectra, life time measurements and CIE diagram, upon different excitation channels elucidate the excellent luminescent properties of La2-x-y (MoO4)3:xTb, yEu nanophosphors with tunable emission colours in a wide range varying from yellow green region to reddish orange region and the efficient energy transfer from Tb3+ to Eu3+ ions in lanthanum molybdate host lattice. The Tb→Eu energy transfer efficiency and probability were calculated from the decay measurements and the values were found to be satisfactory for exploiting the prepared nanophosphors for the development of multifunctional luminescent nanophosphors.

Influence of acceptor concentration on crystallization behavior and luminescence properties of lead borate glasses co-doped with Dy3+ and Tb3+ ions

Lead borate glasses doubly doped with Dy3+–Tb3+ were investigated using optical spectroscopy: photoluminescence and decay time measurements. The main green emission band due to the 5D4→7F5 transition of Tb3+ was observed under excitation of Dy3+. The energy transfer process from Dy3+ to Tb3+ occurs through nonradiative processes. The energy transfer efficiencies and transfer probabilities as a function of a square of the total rare earth ions concentration using Förster method were calculated. The nonlinear behavior of the energy transfer probability and the luminescence intensity ratio for a higher concentration of acceptor was studied taking into account the possible processes: concentration quenching and partial crystallization of the lead borate glasses.

Interaction of promethazine and adiphenine to human hemoglobin: A comparative spectroscopic and computational analysis

The binding nature of amphiphilic drugs viz. promethazine hydrochloride (PMT) and adiphenine hydrochloride (ADP), with human hemoglobin (Hb) was unraveled by fluorescence, absorbance, time resolved fluorescence, fluorescence resonance energy transfer (FRET) and circular dichroism (CD) spectral techniques in combination with molecular docking and molecular dynamic simulation methods. The steady state fluorescence spectra indicated that both PMT and ADP quenches the fluorescence of Hb through static quenching mechanism which was further confirmed by time resolved fluorescence spectra. The UV–Vis spectroscopy suggested ground state complex formation. The activation energy (Ea) was observed more in the case of Hb-ADP than Hb-PMT interaction system. The FRET result indicates the high probability of energy transfer from β Trp37 residue of Hb to the PMT (r=2.02nm) and ADP (r=2.33nm). The thermodynamic data reveal that binding of PMT with Hb are exothermic in nature involving hydrogen bonding and van der Waal interaction whereas in the case of ADP hydrophobic forces play the major role and binding process is endothermic in nature. The CD results show that both PMT and ADP, induced secondary structural changes of Hb and unfold the protein by losing a large helical content while the effect is more pronounced with ADP. Additionally, we also utilized computational approaches for deep insight into the binding of these drugs with Hb and the results are well matched with our experimental results.

Influence of Bi3+ ions on optical and luminescence properties of multi- component P2O5─PbO─Ga2O3 ─Pr2O3 glass system

Glasses with composition (70-x) P2O5─17.5PbO ─10Ga2O3─2.5Pr2O3:xBi2O3 (0 ≤ x ≤ 7) were prepared by conventional melt quenching technique. The prepared glasses were characterized by their XRD patterns. Various spectroscopic studies like FTIR, optical absorption and photoluminescence were carried out on these glasses. The optical absorption spectra exhibited eight absorption bands around 444, 468, 481, 590, 1012, 1424, 1528 and 1941 nm wavelengths corresponding to transitions 3H4 →3P2,3P1, 3P0, 1D2, 1G4, 3F4,3F3 and 3F2 respectively. In addition to the above, the optical absorption spectra have also exhibited additional band at about 444 nm due to the addition of Bi2O3 to the host glass and is ascribed to the 1S0 →3P1 transition of Bi3+ ions. J-O intensity parameters computed from the absorption spectra of the samples by using modified J-O theory exhibited the order Ω2> Ω6> Ω4. Emission spectra of the prepared glasses were recorded at excitation wavelength 444 nm. The luminescence intensity of Pr3+ ions is found to increase with an increase in the concentration of Bi2O3 up to 5 mol% beyond this concentration decreasing trend in it is noticed. Such observed hike in the intensity of luminescence of Pr3+ ions might be due to the occurrence of energy transfer between Pr3+ and Bi3+ ions. Chromaticity color coordinates for all the glass samples were evaluated. Decay curves of all the glass samples exhibit double exponential behavior. Significant energy transfer parameters viz., the luminescence quantum efficiency (ɳQ), energy transfer efficiency (ɳET), energy transfer parameter (Q), energy transfer probability (PDA) and critical transfer parameter (R0) were evaluated for all the titled glasses by using the life time values. From the investigated spectroscopic studies and evaluated energy transfer parameter values it can be seen that the glass sample mixed with 5 mol% of Bi2O3 is a good host that can emit bright reddish - orange laser.

Preparation and characterization of Y2O3:Bi3+,Yb3+ nanosheets with wavelength conversion from near-ultraviolet to near-infrared

Y2O3:Bi3+,Yb3+ nanophosphors, which exhibit near-infrared (NIR) emission under near-ultraviolet (near-UV) excitation, are promising candidates for spectral converters in crystalline silicon solar devices. Herein, Y2O3:Bi3+,Yb3+ nanosheets were prepared by calcination of hydrothermally-synthesized precursors. The effects of the calcination temperature on their properties were investigated. The nanosheets calcined at ≤ 800 °C had sheet-like, square morphologies with average lateral sizes of 210–240 nm, which were smaller than precursor nanosheet with 257 nm attributed to shrinkage through the calcination. The thickness of the nanosheet before and after calcination at 800 °C was ~20 nm. Moreover, the nanosheet had a single-crystal nature. However, at calcination temperatures ≥ 900 °C, the nanosheets lost their morphologies, and transformed into irregular particles. The Y2O3:Bi3+,Yb3+ nanosheets showed visible emission from Bi3+ and NIR emission from Yb3+ under near-UV excitation. The PL intensity and PL decay time of the NIR emission monotonically increased with increasing calcination temperature. Both increases can be explained by the following effects: (i) removal of H2O molecules adsorbed on the nanosheet surface, (ii) improvement of crystallinity and decrease of specific surface area, (iii) increase in probability of energy transfer from Bi3+ to Yb3+, and (iv) oxidation of reduced bismuth during calcination. Furthermore, the photostability of the nanosheets under near-UV excitation was improved by increasing calcination temperature.

Механизм генерации синглетного кислорода в присутствии возбужденного нанопористого кремния

AbstractA theoretical analysis of the mechanism of generation of singlet oxygen in the presence of photoexcited nanoporous silicon is presented. It is demonstrated that the mechanism of generation of singlet oxygen is based on nonradiative energy transfer from nanoporous silicon to an oxygen molecule by the exchange mechanism. An analytical expression of the probability of energy transfer from nanoporous silicon to an oxygen molecule is obtained, and a numerical estimate of this process is given. The numerical estimation is of the order of 10^3–10^4 s^–1, a value that agrees rather well with the experiment.

Energy Transfer to the Hydrogen Bond in the (H2O)2 + H2O Collision.

Trajectory procedures are used to study the collision between the vibrationally excited H2O and the ground-state (H2O)2 with particular reference to energy transfer to the hydrogen bond through the inter- and intramolecular pathways. In nearly 98% of the trajectories, energy transfer processes occur on a subpicosecond scale (≤0.7 ps). The H2O transfers approximately three-quarters of its excitation energy to the OH stretches of the dimer. The first step of the intramolecular pathway in the dimer involves a near-resonant first overtone transition from the OH stretch to the bending mode. The energy transfer probability in the presence of the 1:2 resonance is 0.61 at 300 K. The bending mode then redistributes its energy to low-frequency intermolecular vibrations in a series of small excitation steps, with the pathway which results in the hydrogen-bonding modes gaining most of the available energy. The hydrogen bonding in ∼50% of the trajectories ruptures on vibrational excitation, leaving one quantum in the bend of the monomer fragment. In a small fraction of trajectories, the duration of collision is longer than 1 ps, during which the dimer and H2O form a short-lived complex through a secondary hydrogen bond, which undergoes large amplitude oscillations.

Tunable green to red emission via Tb sensitized energy transfer in Tb/Eu co-doped alkali fluoroborate glass

A new series of emission-tunable alkali fluoroborate glasses with molar composition (70-x-y)B2O3 + 10BaO + 10K2O + 10ZnF2 + xEu2O3 + yTb4O7 (y = 0.0, 1.0mol% and x as 0.0, 0.1, 0.2, 0.5 and 1.0mol%) were prepared using the conventional melt quenching technique. The photoluminescence characteristics of the prepared glasses were explored and the efficient energy transfer between Tb3+ ions and Eu3+ ions under 484nm excitation was confirmed using excitation and emission spectra. The photoluminescence and lifetime measurements reveal the efficient energy transfer from Tb3+ to Eu3+ through quadrupole–quadrupole interaction between the rare earth ions. The important energy transfer parameters such as energy transfer probability and transfer efficiency were computed. The energy transfer efficiency was considerably increased with an increase in the concentration of Eu3+ ions. The CIE chromaticity analysis revealed that the as obtained glassy system exhibits a greenish-orange emission with a low concentration of Eu3+ ions and can be tuned to orange-red emission by increasing the concentration of Eu3+ ions. The obtained results suggest that the prepared glassy system has potential applications in various optoelectronic devices.

Excitability of high-energy ultraviolet radiation for Dy3+ in antimony phosphate glasses

Abstract Dy3+ doped antimony phosphate (ZASP) glasses are synthesized and the specificity of the luminescence behavior is demonstrated. Different from the conventional long-wave ultraviolet (UVA) exciting cases, the excitable area of Dy3+ doped ZASP glasses is extended to high-energy ultraviolet radiation including medium-wave ultraviolet (UVB) and short-wave ultraviolet (UVC) spectral regions. The quantum efficiency for 4F9/2 level of Dy3+ in low- and medium-concentration Dy2O3 doping cases reaches 95.0 % and 66.7 %, respectively, confirming the emission effectiveness from Dy3+ in ZASP glasses. The values of energy-transfer probability (P) have obvious difference while using 340 nm and 540 nm as monitoring wavelengths, so asthe energy-transfer efficiencies (η), which are related to the energy-transfer processes from discrepant Sb3+ donors to Dy3+ acceptors, were in-equivalent. The effective excitability of high-energy ultraviolet radiation illustrates that Dy3+ doped ZASP glasses are a promising candidate in developing visible light sources, display devices and tunable visible lasers.

Energy transfer mechanism and optoelectronic properties of (PFO/TiO2)/Fluorol 7GA nanocomposite thin films

Energy transfer between poly (9,9'-di-n-octylfluorenyl-2,7-diyl) (PFO) as a donor in presence of TiO2 nanoparticles (NPs) and Fluorol 7GA as an acceptor with different weight ratios has been investigated by steady-state emission measurements. Based on the absorption and fluorescence measurements, the energy transfer properties, such as quenching rate constant (kSV), energy transfer rate constant (kET), quantum yield (ϕDA), and lifetime (τDA), of the donor in the presence of the acceptor, energy transfer probability (PDA), energy transfer efficiency (η), energy transfer time (τET), and critical distance of the energy transfer (Ro) were calculated. Förster-type energy transfer between the excited donor and ground-state acceptor molecules was the dominant mechanism responsible for the energy transfer as evidenced by large values of kSV, kET, and Ro. Moreover, these composite materials were employed as an emissive layer in organic light-emitting diodes (OLEDs). Additionally, the optoelectronic properties of OLEDs were investigated in terms of current density–voltage characteristics and electroluminescence spectra.

Probing the interaction of cephalosporin antibiotic–ceftazidime with human serum albumin: A biophysical investigation

The fate of drug administered to a living organism depends on drug’s pharmacokinetics as well as pharmacological behavior. Serum albumins (proteins in blood plasma of human) act as a carrier molecule to deliver the drug at specific site. In the present study, we have explored the mechanism of interaction between cephalosporin antibiotic–ceftazidime (CFD) and human serum albumin (HSA) by spectroscopic and molecular docking studies. Quenching of HSA fluorescence by CFD inferred that it binds to HSA through static quenching mechanism; with binding affinity in order of 104M−1. Fluorescence resonance energy transfer (FRET) results shows that donor and acceptor molecule are at 2.08nm apart and also reflects the high probability of energy transfer between HSA and CFD. Change in secondary structure as well as microenvironment around both tryptophan and tyrosine residue, were monitored by Circular Dichroism (CD) and Synchronous fluorescence spectroscopy respectively; confirms that CFD increases the alpha helical secondary structure as well as altered the environment around tryptophan and tyrosine. The specific binding site of CFD on HSA was determined by site-specific markers and molecular docking methods. CFD preferably bind to subdomain IIIA (Sudlow site II) on HSA.

Impact sensitivity of crystalline phenyl diazonium salts: A first-principles study of solid-state properties determining the phenomenon

Two crystalline salts, phenyl diazonium chloride (PDC) and tetrafluoroborate (PDT), were chosen as probes for theoretical study of solid-state properties responsible for impact sensitivity since these salts differ only in the nature of anion and, hence, in the properties of solid state. In the present report, we have studied the influence of electronic structure, vibrational spectra, mechanical properties, crystal growth morphology, and the stored energy content on impact sensitivity of PDC and PDT to find the most important solid state characteristics governing this phenomenon. The band structure calculations at various external pressures indicate very different response of the band gap. Extremely sensitive PDC crystals acquire the metallic nature at 29 GPa (metallization point), whilst in the PDT crystals the complete closure of band gap occurs only at 200 GPa. Moreover, the stored energy content in PDC is by 1000 kJ mol−1 higher than that of PDT. Only these two properties among the calculated in the present work differ significantly in the studied crystals. The rest solid-state characteristics such as crystal packing, vibratial spectra (phonon-valence vibration energy transfer probability), elastic properties (bulk moduli) demonstrate rather close values. The influence of metallization point (GPa) as well as crystal growth morphology on impact sensitivity is discussed for the first time.

Synthesis and luminescent properties of GdNbO4:Bi3+ phosphors via high temperature high pressure

This work reports the high-pressure and high-temperature (HP-HT) synthesis of pure monoclinic phase of GdNbO4:Bi3+ phosphors. X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, photoluminescence, and IR spectra were utilized to characterize the synthesized phosphors. The crystal structure distortions operated by the pressure leads to tunable emission varying from blue to yellow. A small increase of the probability of non-radiative energy transfer with increase of pressure is observed. It is shown that the efficiency of the energy transfer process is dependent on pressure. The calculations of CIE chromaticity coordinates were performed.

Vibrational relaxation of S2(a1Δg) by collisions with SF6 and CF4

Irradiation of the pulsed laser light at 248nm to the gaseous mixture of OCS and He generated vibrationally excited S2(a1Δg,v=2-4) by the S(1D)+OCS reaction. A single vibrational level of S2(a1Δg) was detected with laser-induced fluorescence (LIF) via the f1Δu-a1Δg transition. The rate coefficients for energy transfer from vibrational levels v=2 and 3 of S2(a1Δg) to SF6 and CF4 have been determined from the time-resolved LIF intensities recorded at varying pressures of SF6 and CF4. The reduced probability of energy transfer per collision derived from the rate coefficients enabled us to identify the ν4 mode of SF6 and CF4 as the energy-accepting vibration.

Luminescence properties of yttrium gadolinium orthovanadate nanophosphors and efficient energy transfer from VO43− to Sm3+via Gd3+ ions

In this paper, luminescence properties of orthovanadates, Y1−x−yGdxVO4:ySm3+ (where x=0.05–0.50, y=0.01–0.05), and the energy transfer mechanism from VO43− to Sm3+ via Gd3+ ions were investigated in detail. X-ray diffraction (XRD) analysis confirmed the crystalline phase for synthesized nanophosphor in a tetragonal structure with I41/amd space group. The average crystallite size estimated from XRD was ∼28nm. Field-emission scanning electron microscopy coupled with energy dispersive X-ray analysis revealed oval shaped morphology and composition of the nanophosphor, respectively. From high-resolution transmission electron microscopy observations, the particle sizes were found to be in the range 10–80nm. The photoluminescence studies of Y0.77Gd0.20VO4:0.03Sm3+ nanophosphor under 311nm excitation exhibits dominant emission peak at 598nm corresponding to 4G5/2→6H7/2 transition. The energy transfer occurs from VO43− to Sm3+ via Gd3+ ions was confirmed by applying Dexter and Reisfeld’s theory and Inokuti-Hirayama model. Moreover, the energy transfer efficiencies and probabilities were calculated from the decay curves. Furthermore, Commission Internationale de l’Eclairage (CIE) color coordinate (0.59, 0.37) has been observed to be in the orange-red (598nm) region for Y0.77Gd0.20VO4:0.03Sm3+ nanophosphor. These results perfectly established the suitability of these nanophosphors in improving the efficiency of silicon solar cells, light emitting diodes, semiconductor photophysics, and nanodevices.

Multicolor and white light emitting Tb3+/Sm3+ co-doped zinc phosphate barium titanate glasses via energy transfer for optoelectronic device applications

A series of Tb3+/Sm3+ co-doped ZPBT glasses have been successfully prepared via melt quenching technique and their photoluminescence properties and energy transfer mechanism were investigated. Tb3+ doped glass exhibits dominant emission peak at 544 nm corresponding to 5D4→7F5 transition under 375 nm excitation whereas Sm3+ doped glass exhibits intense emission peak at 599 nm corresponding to 4G5/2 → 6H7/2 under 399 nm excitation. The CIE chromaticity coordinates (0.259, 0.590) and (0.570, 0.428) are located in the pure green and orange region for Tb3+ and Sm3+ doped glasses, respectively. The Tb3+/Sm3+ co-doped glasses under 375 nm excitation emit a combination of blue, green and orange-red light while under 484 nm excitation emits green and red-orange emission light. The energy transfer occurs from Tb3+ to Sm3+ via dipole-dipole interaction, which was confirmed by applying Dexter and Reisfeld's theory and Inokuti Hirayama (I-H) model. Moreover, the energy transfer efficiencies and probabilities were calculated from the decay curves. The color tone of these glasses can be modulated from yellowish-green to warm-white via greenish-yellow by appropriate tuning of Sm3+ concentrations and excitation wavelengths. These results indicate that the prepared glasses can be a potential candidate for white light as well as solid state lighting applications.

Role of adiabaticity in controlling alkali-metal fine-structure mixing induced by rare gases

The collision cross sections for alkali-metal--rare-gas spin orbit mixing between the ${n}^{2}{P}_{3/2}\ensuremath{\rightarrow}{n}^{2}{P}_{1/2}$ levels trend strongly with the Massey parameter, or adiabaticity of the collisions. The strength of the interaction, as characterized by the ${C}_{6}$ dispersion coefficient, is a secondary influence on the rates. An analytic expression for the probability of energy transfer in alkali-metal--rare-gas collisions is derived using time-dependent perturbation theory. The model agrees well with a broad literature survey of the observed temperature-dependent cross sections. A simple interaction potential successfully organizes the alkali-metal--rare-gas database. The rates become very large for high-lying states, as the collisions are quite sudden and the radius of the valence electron is large. In contrast, the highly adiabatic cesium ${6}^{2}P$ mixing rates are six to eight orders of magnitude smaller. The mixing rate for the Rb-He diode pumped alkali laser system varies from $0.20--1.53\phantom{\rule{4pt}{0ex}}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}\mathrm{cm}{}^{3}/\mathrm{at}.\phantom{\rule{0.16em}{0ex}}\mathrm{s}$ for $T=279--893\phantom{\rule{0.222222em}{0ex}}\mathrm{K}$.

Multicolor emission in lithium-aluminum-zinc phosphate glasses activated with Dy3+, Eu3+ and Dy3+/Eu3+

A spectroscopic analysis of Dy3+, Eu3+ and Dy3+/Eu3+ doped lithium-aluminum-zinc phosphate glasses is carried out based on absorption and photoluminescence spectra and decay time measurements. According to the CIE1931 chromaticity coordinates and correlated color temperature (CCT), neutral white and reddish-orange global emissions were observed in the Dy3+ and Eu3+ singly-doped glasses, respectively, after excitations of Dy3+ at 348 nm and Eu3+ at 393 nm. A high red color purity of 97.2% is achieved in the Eu3+ singly-doped glass excited at 393 nm. Upon Dy3+ excitation at 348 nm, the Dy3+/Eu3+ doped glass showed warm white overall emission, with CCT value of 3629 K. Upon Dy3+ and Eu3+ co-excitations at 362, 381 and 387 nm, the Dy3+/Eu3+ doped glass showed reddish-orange overall emissions, with CCT values in the 1620–2385 K range, depending on the excitation wavelength. In the Dy3+/Eu3+ doped glass excited at 348 nm, the warm white emission was achieved by a non-radiative energy transfer from Dy3+ to Eu3+ with an efficiency and probability of 0.08 and 89.51 s−1, respectively. The dominant mechanism could be through an electric quadrupole–quadrupole interaction, as it is suggested from the Inokuti-Hirayama model. A back non-radiative energy transfer from Eu3+ to Dy3+ is also observed, which could also be mediated by an electric quadrupole–quadrupole interaction. The Eu3+ to Dy3+ energy transfer efficiency and probability being of 0.08 and 30.00 s−1, respectively.