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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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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: LaNbO4:Tb3+,Eu3+, luminescence, pc-WLED, Phase control

Date published: 2024-03-15

Publisher: ELSEVIER SCI LTD

Journal:

• Ceramics International (ISSN: 02728842) vol. 50 issue. 11 p. 20632-20643

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4507

First published URL: https://doi.org/10.1016/j.ceramint.2024.03.184

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Updated at: 2026-03-15 12:30:04 +0900

Published on MDR: 2026-03-15 09:41:16 +0900