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Discovery of new broadband yellow‐emitting nitridoalumosilicate phosphor and its pc‐WLED application
Author(s) -
Ye Shanshan,
Zhao Quan,
Geng Wanying,
Zhang Weibin,
Cai Zhihui,
Wu Peng,
Ding Jianyan,
Wu Quansheng
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.17909
Subject(s) - phosphor , photoluminescence , full width at half maximum , materials science , luminescence , crystal structure , excited state , analytical chemistry (journal) , thermal stability , quantum efficiency , emission spectrum , optoelectronics , spectral line , chemistry , crystallography , atomic physics , physics , organic chemistry , chromatography , astronomy
Developing a yellow phosphor with broadband emission covering more red‐light areas is an effective approach to achieve high‐quality solid‐state lighting. In this study, a novel yellow‐emitting nitride phosphor, Ca 5 Si 2 Al 2 N 8 :Ce 3+ , was successfully prepared at atmospheric pressure and lower temperatures (1300°C), and its structure‐property relation was revealed using crystal refinement, photoluminescence (PL) spectra, time‐resolved PL spectra, and density‐functional theory calculations. The results demonstrate that Ca atoms occupy three different crystallographic sites in the lattice, which are substituted by Ce 3+ to form multiple luminescence centers. Thus, Ca 5 Si 2 Al 2 N 8 :Ce 3+ emits strong yellow light with a maximum peak at 585 nm and a wide emission band. Compared with YAG:Ce 3+ , Ca 5 Si 2 Al 2 N 8 :Ce 3+ has a wider emission band with a FWHM of 150 nm, which can effectively cover the green and red areas. Moreover, the sample can be fully excited by a blue LED chip due to its broad excitation band. Notably, the Ca 5 Si 2 Al 2 N 8 's tight crystal structure composed of edge‐sharing AlN 4 and SiN 4 tetrahedra pairs guarantee its thermochemical stability and quantum efficiency. Furthermore, Ca 5 Si 2 Al 2 N 8 :Ce 3+ exhibits better thermal stability than YAG:Ce 3+ . The results indicate that Ca 5 Si 2 Al 2 N 8 :Ce 3+ is a promising yellow phosphor for WLEDs.