Lead halide perovskite quantum dots (LHP QDs) exhibit great potential in the backlighting display of light-emitting diode applications. Light-emitting backlighting with high brightness, low cost, and wide color gamut can be achieved based on LHP QDs, which have the advantages of high luminescence performance, tunable emission, and facile synthesis. However, some drawbacks, including instability and large-scale synthesis, that restrict the practical application of LHP QDs remain. This Review focuses on solutions to these obstacles. The gap between fundamental knowledge to backlighting applications must be narrowed. The strategies for stability improvements and scalable synthesis are summarized and clarified. This Review provides inspiration for the optimization of LHP QDs, promotes their application in wide color gamut backlighting, and contributes to current and future display solutions.

A novel blue-emitting phosphor Na3Sc2(PO4)3:Eu2+ was successfully synthesized by solid-state reaction.

This review investigates the thermal behaviors of phosphors and summarizes phosphors with excellent thermal stabilities.

A novel garnet phosphor Ca 2 YZr 2 Al 3 O 12 :Ce 3+ (CY-ZA:Ce 3+ ) has been successfully designed and synthesized via the solid state method. The crystal structure, morphology, as well as their photoluminescence properties were investigated in detail. Under nearultraviolet (n-UV) excitation, CYZA:Ce 3+ exhibits cyan to green emission with the maxima from 484 to 503 nm when varying the Ce 3+ concentration. The internal quantum efficiency of the optimal sample is 56%. The concentration quenching of Ce 3+ emission occurs via the energy transfer among the nearest-neighbor ions. The thermal stability is superior compared with the Ba 2 SiO 4 :Eu 2+ commercial phosphor. These results suggest that CYZA:Ce 3+ can be considered as a potential candidate for white LEDs.

A series of CaYZrAlO:Eu (CYZA) phosphors were successfully synthesized through conventional solid-state method. The electronic structure and their photoluminescence or cathodoluminescence properties were investigated in detail. Under n-UV excitation, the CYZA:Eu exhibits more intense red emission than the commercial YO:Eu phosphor. A WLED lamp with good color render index was obtained by fabricating the phosphor with BAM:Eu and LuAG:Ce phosphors. The phosphor also exhibits red emission with high current saturation and high resistance under low voltage electron bombardment. The degradation resistance can be compared to the commercial YO:Eu phosphor. All the results indicate that the CYZA:Eu has potential applications in both white LEDs and FEDs.

A variety of Eu-activated BaZrGeO phosphors was synthesized via solid-state reaction. The phase formation of BaZrGeO:Eu samples was verified by powder X-ray diffraction analysis, while Rietveld refinement method was used to confirm the crystal structure. The electronic structure and characteristic photoluminescence as well as cathodoluminescence properties were researched in detail. The samples show strong absorption at 394 nm, which matches well with the commercial near-ultraviolet chips. Under 394 nm excitation, the phosphors exhibit the characteristic emissions of Eu ions consistent with the D-F transitions. Then we investigated the thermal stability detailedly. The temperature-dependent photoluminescence emission spectra suggest that the obtained phosphors have favorable thermal stability. A white light-emitting diode (WLED) lamp with low correlated color temperature and good color render index was fabricated with blue-emitting BaMgAlO:Eu, green-emitting SrSiO:Eu (commercial), and red-emitting BaZrGeO:Eu phosphors in near-ultraviolet light-emitting diodes (λ = 395 nm) as well. Furthermore, the phosphor also exhibits red emission with high resistance and high current saturation under low voltage electron bombardment. It has better degradation resistance than the commercial YO:Eu phosphor. All the results manifest that the BaEuZrGeO phosphor can be an eligible red-emitting phosphor candidate for WLEDs and field-emission displays.

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We studied the crystal structure of Y4Si2O7N2 and the relationship between the crystal structure and the luminescence properties.