Novel orange-yellow-green color-tunable Bi-doped BaYLuO (0 ≤ ≤ 4) luminescent materials: site migration and photoluminescence control

• Published in: Inorganic chemistry frontiers Vol. 6; no. 12; pp. 3598 - 363
• Main Authors: Xing, Gongcheng, Gao, Zhiyu, Tao, Mengxuan, Wei, Yi, Liu, Yixin, Dang, Peipei, Li, Guogang, Lin, Jun
• Format: Journal Article
• Language: English
• Published: 03.12.2019
• ISSN: 2052-1553
• DOI: 10.1039/c9qi01099h

A novel orange-yellow-emitting Ba 3 Y 4 O 9 :Bi 3+ phosphor (550 nm) has been firstly discovered. Meanwhile, we report isomorphic Ba 3 Lu 4 O 9 :Bi 3+ with green emission (526 nm). Based on the cation substitution strategy, a series of Ba 3 Y 4− w Lu w O 9 :Bi 3+ (0 ≤ w ≤ 4) solid solution phases are successfully constructed, realizing consecutive photoluminescence control from orange-yellow to green light. The occurrence of site migration of Bi 3+ ions from Y2/Lu2 and Y4/Lu4 to Y1/Lu1 and Y3/Lu3 sites results in the blueshift of Ba 3 Y 4− w Lu w O 9 :Bi 3+ (0 ≤ w ≤ 4), which is confirmed by the linear increase of PL intensity I (1+3) / I (2+4) with the substitution of Lu 3+ ions for Y 3+ ions. Besides, the improved thermal stability of Ba 3 Y 4− w Lu w O 9 :Bi 3+ (0 ≤ w ≤ 4) with the substitution of Lu 3+ for Y 3+ originates from the better structure rigidity. The fabricated white light-emitting diodes (WLEDs) exhibit excellent warm white light, indicating that the as-prepared Ba 3 Y 4− w Lu w O 9 :Bi 3+ (0 ≤ w ≤ 4) phosphors can act as a green to yellow emitting component in WLED lighting. The site migration of Bi 3+ induced orange-yellow-green photoluminescence control in Ba 3 Y 4− w Lu w O 9 (0 ≤ w ≤ 4).