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Optimization of Ce 3+ concentration and Y 4 MgSi 3 O 13 phase in Mg 2+ ‐Si 4+ Co‐doped Ce: YAG ceramic phosphors
Author(s) -
Tian Yanna,
Tang Yanru,
Yi Xuezhuan,
Chen Jie,
Sun Shiyu,
Zhao Di,
Lin Hui,
Zhou Shengming
Publication year - 2020
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.17388
Subject(s) - phosphor , chromaticity , analytical chemistry (journal) , luminescence , impurity , materials science , doping , light emitting diode , thermal stability , chemistry , optics , optoelectronics , physics , organic chemistry , chromatography
As a promising replacement for nitride red phosphors, Ce: Y 3 (Mg 1.8 Al 1.4 Si 1.8 )O 12 (Ce: YMASG) ceramic phosphors have attracted significant attention recently for their advantages in inorganic encapsulation and massive red‐shifting of Ce 3+ emission. In this work, Ce: YMASG with different doping concentrations of Ce 3+ and Al 2 O 3 , was fabricated by vacuum sintering to investigate its effects on the elimination of the impurity phase and the enhancement of the luminescent properties of white light‐emitting diodes (w‐LEDs). It was discovered that the emission wavelength redshifts from 592 to 606 nm as the Ce 3+ concentration increases, while at 450 K, the emission intensity deteriorates from 0.47 to 0.36 of its initial value. The Rietveld analysis revealed the presence of an impurity phase of Y 4 MgSi 3 O 13 with a concentration of 17.021 wt% in Ce: YMASG. With the introduction of Al 2 O 3 , the impurity phase was eliminated from the matrix completely, the emission peak shifted to a shorter wavelength, and the thermal stability was greatly improved. When the correlated color temperature was controlled at around 3000 K in the packaged w‐LEDs, the commission international de l'éclairage (CIE) chromaticity coordinates shifted toward the bottom left corner of the diagram with increasing concentration of Ce 3+ . Conversely, the luminous efficiency (LE) increased from 36 lm/W to 58.6 lm/W as the concentration of Al 2 O 3 increased from 0 to 10 wt%, which demonstrated the application prospect of the fabricated phosphor in warm w‐LEDs.