Facile preparation of patterned phosphor-in-glass with excellent luminous properties through screen-printing for high-power white light-emitting diodes

• DOI: 10.1016/j.jallcom.2016.09.197
• Publication Date: 2016-09-20T23:17:48Z
• Authors: Yang Peng; Ruixin Li; Hao Cheng; Zhen Chen; Hong Li; Mingxiang Chen
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract In order to improve the luminous properties of high-power white light-emitting diodes (WLEDs), we proposed a facile preparation of patterned phosphor-in-glass (PiG) in which yellow Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) and red CaAlSiN 3 :Eu 2+ (CASN:Eu 2+ ) phosphor parts are separated. The patterned PiGs with sector piece and concentric ring phosphor geometries were prepared by screen-printing and low-temperature sintering. Experimental results indicated that LED modules packaged by the patterned PiGs yield high luminous efficacy and excellent color quality owing to the reducing reabsorption of yellow emission by red phosphor. In addition, the angular color uniformity (ACU) of LED modules with the ring patterned PiGs are better than those of LED modules with the piece patterned PiGs. It is also discovered that the luminous efficacy and corresponding correlated color temperature (CCT) of LED module packaged by the piece/ring patterned PiG are decreased with the increasing of piece/ring number.