Premium
Effect of Boron Nitride (BN) on Luminescent Properties of Y 3 Al 5 O 12 : Ce Phosphors and their White Light‐Emitting Diode Characteristics
Author(s) -
Wang Xiaojun,
Zhang Hailong,
Zhao Yi,
Liu Xinjuan,
Li Huili,
Zhang Zhejuan,
Sun Zhuo
Publication year - 2012
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2012.02804.x
Subject(s) - phosphor , materials science , light emitting diode , color rendering index , luminescence , color temperature , boron nitride , photoluminescence , luminous efficacy , analytical chemistry (journal) , nitride , optoelectronics , crystallinity , diode , nanotechnology , composite material , chemistry , layer (electronics) , chromatography
This article reports a low‐cost yellow‐emitting Y 3 Al 5‐ x B x O 12‐ x N x : Ce 3+ phosphor with an enhanced luminescent intensity and excellent thermal stability for white light‐emitting diodes ( LEDs ). It was synthesized by a simple gas‐pressure sintering ( GPS ) process. The effect of B 3+ – N 3− incorporation on the optical properties of Y 3 Al 5 O 12 : Ce 3+ phosphor was investigated. The addition of appropriate amounts of boron nitride (BN) leads to a marked increase in photoluminescent intensity and a slight shift of its emission spectra toward the blue region, which is assigned to the improved crystallinity and increased particle size. Especially, the prepared oxynitride phosphor does not exhibit any thermal quenching under high temperature, and the emission intensity at 250°C even increases up to 175% of that measured at 20°C. Finally, the white LED flat lamp with luminous efficiency as high as 101 lm/W, color rendering index of 72, and correlated color temperature of about 6600 K is successfully realized by using YAG : Ce 3+ phosphor doped with 0.5 molar ratio BN , which is acceptable and promising for general indoor illuminations to replace fluorescent or incandescent lamps.