Phase tailoring and color-tunable luminescence of LaNbO4:Tb3+,Eu3+ nanophosphors for deep UV-pumped pc-WLEDs application

Meiting Li; Bingxin Yuan; Xiangyang Zheng; Bo Chen; Chi Zhang; Xuejiao Wang; Ji-Guang Li

doi:10.1016/j.ceramint.2024.03.184

論文 Phase tailoring and color-tunable luminescence of LaNbO4:Tb3+,Eu3+ nanophosphors for deep UV-pumped pc-WLEDs application

Meiting Li (Research Center for Functional Materials/Functional Powder and Advanced Ceramics Field/Field-Assisted Sintering Group, National Institute for Materials Science) ; Bingxin Yuan (Liaoning University of Technology) ; Xiangyang Zheng (Liaoning University of Technology) ; Bo Chen (Liaoning University of Technology) ; Chi Zhang (Liaoning University of Technology) ; Xuejiao Wang (Bohai University) ; Ji-Guang Li (Research Center for Electronic and Optical Materials/Optical Materials Field/Polycrystalline Optical Material Group, National Institute for Materials Science)

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Meiting Li, Bingxin Yuan, Xiangyang Zheng, Bo Chen, Chi Zhang, Xuejiao Wang, Ji-Guang Li. Phase tailoring and color-tunable luminescence of LaNbO4:Tb3+,Eu3+ nanophosphors for deep UV-pumped pc-WLEDs application. Ceramics International. 2024, 50 (11), 20632-20643. https://doi.org/10.1016/j.ceramint.2024.03.184

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(abstract)

A series of LaNbO4:RE3+ (RE=Tb and Eu) phosphors were successfully synthesized via a calcination-assisted hydrothermal reaction, where the vital roles of solution pH, calcination temperature and NbO43-/La3+ molar ratio in phase/morphology evolution of LaNbO4 nanocrystals were elaborated. It was unambiguously demonstrated that monoclinic LaNbO4 can be crystallized at solution pH=8-13 after calcination at 900 ºC. With pH=10 precursor for example, higher calcination temperature led to phase transformation from orthorhombic to monoclinic structure. LaNbO4 nanoparticles exhibit self-activated broad-band excitations (1A1 → 1T1,2) and emissions (3T2,1 → 1A1) within the NbO43- ligand. Intriguingly, Tb3+/Eu3+ incorporations allow for phase tailoring and full-visible-spectrum color-tunable luminescence, where the latter benefits from the effective NbO43- → Tb3+ → Eu3+ energy transfer. LaNbO4:0.01Tb3+,0.01Eu3+ phosphor exhibits stronger white-light emission, which gradually drifts to yellowish green at high heating temperature. This phosphor is an attractive candidate for optical thermometers and warm pc-WLED owning to excellent thermal stability, a low correlated color temperature of ~5694 K and a high color rendering index of ~90.

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