Flexible fabrication of a patterned red phosphor layer on a YAG:Ce3+ phosphor-in-glass for high-power WLEDs

• DOI: 10.1364/ome.8.000605
• Publication Date: 2018-02-12T17:31:39Z
• Authors: Yang Peng; Yun Mou; Xing Guo; Xujia Xu; Hong Li; Mingxiang Chen; Xiaobing Luo
• Keywords: Color rendering index; Color temperature; Ultraviolet; Luminous efficacy

We proposed a flexible and mask-less approach to directly fabricate patterned red phosphor layer on Y3Al5O12:Ce3+ (YAG:Ce3+) phosphor-in-glass (PiG) for high-power white light-emitting diodes (WLEDs). This was realized by ultraviolet (UV) assisted initiative cooling based water condensing. A low-temperature precursor glass matrix with high refractive index synthesized the YAG:Ce3+ PiG. By controlling UV pre-curing time, micro-concaves adjustable sizes were fabricated embedded UV-curable polymer. With time of 20 s, 30 40 average aspect ratio micro-concave is 1.03, 0.76, 0.41, respectively. Consequently, sample achieves highest luminous efficacy (LE) 108.5 lm/W at current 350 mA, which 16.2% higher than unpatterned sample. The corresponding correlated color temperature (CCT) rendering (CRI) are 4831 K 80.5, results demonstrate that PiG coated condensing feasible effective method enhance light extraction quality WLEDs.