Red-emitting La1-xSr2AlO5:xEu3+ (x = 0.01-0.06) phosphors have been synthesized via gel combustion (GC) approach and their structure and luminescent characteristics were analyzed in detail. The tetragonal crystal structure (I4/mcm space group) of all generated La1-xSr2AlO5:xEu3+ (x = 0.01-0.06) phosphors have been established by X-ray diffraction and rietveld analysis. The shape and size of the phosphor has been examined using transmission electron microscopy (TEM) and the estimated crystallite size was found to be 32–65 nm. Energy Dispersive X-ray (EDX) analysis confirmed the chemical composition of the synthesized materials. The diffuse reflectance spectra (DRS) were used to compute the band gap energies (Eg) of the samples which emerged to be in region of 5.373-6.009 eV. The Eu3+ activated LaSr2AlO5 phosphors produce red emissions at 579, 592, 614, 656 and 708 nm, when excited at 395 nm. These emission bands are caused by 5D0→7FJ (J = 0, 1, 2, 3, 4) electronic transitions of Eu3+ ion. The Judd-Ofelt theory further supports the performance of LaSr2AlO5:Eu3+ phosphors as a red emitting substance with high branching ratio corresponding to 5D0→7F2 transition from Eu3+ center present in the low symmetry site. Computed chromaticity coordinates (x, y) indicate a high degree of color purity in the phosphors, providing additional evidence for the presence of red emission. Temperature dependent emission (PL) spectra revealed good thermal stability of the synthesized nanophosphors with activation energy (Ea) of 0.1384 eV. 

Red-emitting Eu3+ activated LaSr2AlO5 phosphor for wLEDs: Crystal structure, photoluminescence, thermal stability, Judd-Ofelt calculation and band-gap analyses

A novel efficient red-emitting K7SrY2B15O30: Eu3+ phosphor with non-concentration quenching and robust thermal stability for white LEDs.

The Sm3+-doped Y2MgTiO6 phosphor was successfully synthesized by high-temperature solid-phase method. X-ray diffraction, photoelectron spectroscopy and scanning electron microscopy characterized the phase, electronic structure and morphology. Meanwhile, the luminescence properties were analyzed, and the results showed that the Y2MgTiO6:Sm3+ phosphors emit vibrant orange light when excited at 407 nm, with emission peaks at 565 nm, 603 nm, and 649 nm. The luminescence efficiency of the sample reaches 79.71% of the initial intensity at 423 K. The temperature sensing properties of Y2MgTiO6:Sm3+ phosphors were investigated between different wavelength bands based on the fluorescence intensity ratio (FIR) technique, where FIR (I565/I649) had the maximum relative sensitivity of 0.26% K−1 at 298K. The quantum yield of the sample was 59.88%, with calculated Correlated Color Temperature of 1646 K. The research results suggest that Y2MgTiO6:Sm3+ phosphors have potential applications in optical temperature sensing and w-LEDs devices. 

Novel orange-red emitting phosphor Y2MgTiO6:Sm3+ luminescence properties and optical thermometry

Red-emitting phosphors with high efficiency and good thermal stability is of great importance for white light-emitting diodes (WLEDs) application. Here, Eu3+ doped Na2YbMg2(VO4)3 red-emitting phosphors were successfully prepared by the sol-gel method. The crystal structures, luminescence properties, and thermal stability of the samples were investigated and discussed in detail. Surprisingly, no concentration quenching effect was observed even though the doping concentration of luminescent centers reach 100 %. The intense red emission under 355 nm excitation, high color purity (95.34 %), high quantum yield (75.2 %), and a high value of activation energy (0.293 eV) indicate that the phosphors have promising applications for WLEDs. Finally, the samples were prepared as red-light components for WLEDs. The correlated color temperature, and color rendering index of the WLEDs devices driven by 400 mA current were 4902 K, and 78.1, respectively. The temperature sensing properties based on the fluorescence intensity ratio (FIR) technique was discussed. The maximal absolute sensitivity of the sample is up to 5.08 % K−1 at 480 K. Hence, the as-prepared sample has potential applications in the lighting field and optical thermometry. 

Non-concentration quenching phosphor Na2YbMg2(VO4)3: Eu3+ for WLEDs and optical thermometry applications

Comparative study of red-emitting pyrophosphate phosphors: Site-selective replacement of Eu3+ and luminescent properties

Ratiometric optical thermometer with high-sensitive temperature sensing based on tunable luminescence of Ce3+-Eu2+ in KSr4B3O9 phosphors

Red phosphor often plays a crucial role in enhancing the lighting quality of WLEDs. However, it still remains difficult to develop a red phosphor with high efficiency, outstanding thermal stability,...

Defect-induced zero thermal quenching of a bright red-emitting nonlinear optical material

With the development of solid-state lighting, full-spectrum lighting has gradually received extensive attention. Until now, Bi3+-doped narrow-band blue phosphors have been widely reported, but broadband green-yellow Bi3+-doped luminescent materials generated by metal-to-metal charge transfer have been rarely reported. In this study, a Bi3+ ion doped germanate luminescent material CsAlGe2O6:x%Bi3+ (1 ≤ x ≤ 11) is synthesized by a high-temperature sintering method. The phosphor can generate a broad green-yellow band peaking at 535 nm with a full width at half maximum of 165 nm under ultraviolet radiation. Through the analysis of the coordination environment, photoluminescence spectra and decay curves, the broadband emission spectra of Bi3+ ions are proved to be generated by the metal-to-metal charge transfer state and the 3P1 → 1S0 transition. By using theoretical research, luminescence kinetics, and Gaussian fitting, the luminescence mechanism of Bi3+ is examined. Meanwhile, the high quantum efficiency and superior thermal stability prove that the phosphor can be used as an efficient luminescent material in the field of full-spectrum LED devices.

A metal-to-metal charge transfer induced green-yellow phosphor CsAlGe2O6:Bi3+ for full-spectrum LED devices.

In the development of novel phosphors for solid-state light applications, the suitable excitation peak matching with blue LED chip was usually neglected. However, the excitation peak of phosphors was strongly related to the Stocks shift, crystal field splitting and centroid shift. Here, an environmentally friendly borate phosphor KSr4B3O9: Eu2+ with the maximum excitation peak position at ∼460 nm was prepared in a quite mild synthesis condition. With a blue light excitation, KSr4B3O9: Eu2+ phosphors could emit a bright yellow light centered at ∼560 nm, which could be attributed to the drastic centroid shift and strong crystal field splitting. The strong electron cloud overlaps between Eu-O and the high electron density on the O atom turned out to be the main reason that induces the strong nephelauxetic effect. And the strong crystal field splitting was benefited to the relatively short average Sr-O distance and the large Sr-O distances distribution range from ∼2.23 to 2.96 Å. Meanwhile, the Eu2+ occupation of all the Sr2+ sites in KSr4B3O9 host identified by Rietveld refinement, cryogenic emission spectra and Eu3+ fluorescent probe gave another evidence to the wide absorption region. The final WLED device and 3D colorful artwork were fabricated and displayed to suggest a potential application in the solid-state lighting field and some expressions of aesthetic concepts. This article is protected by copyright. All rights reserved 

Blue light‐excitable eu‐doped yellow emitting borate KSr
 4
 B
 3
 O
 9
 phosphor for white light‐emitting diodes

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A novel efficient red-emitting K7SrY2B15O30: Eu3+ phosphor with non-concentration quenching and robust thermal stability for white LEDs.

Ratiometric optical thermometer with high-sensitive temperature sensing based on tunable luminescence of Ce3+-Eu2+ in KSr4B3O9 phosphors

Defect-induced zero thermal quenching of a bright red-emitting nonlinear optical material

A metal-to-metal charge transfer induced green-yellow phosphor CsAlGe2O6:Bi3+ for full-spectrum LED devices.

Blue light‐excitable eu‐doped yellow emitting borate KSr 4 B 3 O 9 phosphor for white light‐emitting diodes