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Broadband excited Na 3 Tb(PO 4 ) 2 :Ce 3+ /Eu 2+ green/yellow‐emitting phosphors with high color purity for LED‐based application
Author(s) -
Huang Shuai,
Yu Lixin,
Peng Kangliang,
Zhao Youjun,
Wang Jindi,
Shang Mengmeng
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17969
Subject(s) - phosphor , color temperature , color rendering index , materials science , light emitting diode , analytical chemistry (journal) , green light , quantum yield , quantum efficiency , optoelectronics , luminescence , photoluminescence , chemistry , optics , fluorescence , blue light , physics , chromatography
To enhance the display quality of light‐emitting diodes (LEDs), it is of great significance to exploit green/yellow‐emitting phosphors with narrow emission band, high quantum yield, and excellent color purity to satisfy the application. Herein, orthophosphate‐based green/yellow‐emitting Na 3 Tb(PO 4 ) 2 :Ce 3+ /Eu 2+ (NTPO:Ce 3+ /Eu 2+ ) phosphors have been successfully synthesized by a facile solid‐state reaction method. The absorption band of NTPO samples was extended to the near‐ultraviolet region and the absorption efficiency was significantly improved owing to a highly efficient energy transfer from Ce 3+ /Eu 2+ ion to Tb 3+ ion in NTPO host certified by time‐resolved PL spectra. Upon 300 nm excitation, the NTPO:Ce 3+ is characterized by ultra‐narrow‐band green emission of Tb 3+ with an absolute quantum yield of 94.5%. Unexpectedly, NTPO:Eu 2+ emits bright yellow light with a color purity of 73% as a result of the blending of green light emission from Tb 3+ and red light emission from Eu 3+ . The thermal stability has been improved by controlling the stoichiometric ratio of Na + . The prototype white LED used yellow‐emitting NTPO:Eu 2+ phosphor has higher color‐rendering index (Ra = 83.5), lower correlated color temperature (CCT = 5206 K), and closer CIE color coordinates (0.338, 0.3187) to the standard white point at (0.333, 0.333) than that used green‐emitting NTPO:Ce 3+ phosphor, indicating the addition of the yellow light component improved the Ra of the trichromatic (RGB) materials.