高显指白光PiG荧光薄膜制备与激光照明应用

Preparation and Laser-driven Lighting Application of High-CRI White Light PiG Film

通过将玻璃粉体与发射波长为535~550 nm的黄绿色和660 nm的红色荧光粉混合制备出浆料,采用丝网印刷方法将其印刷在高热导蓝宝石片上,在较低烧结温度下成功制备出具有高显指白光的PiG荧光薄膜(Phosphors in glass flim,PiGF),并系统地研究了玻璃/荧光粉比例及荧光粉配比对PiGF在色温(CCT)、显色指数(CRI)、发光效率(LE)等方面的影响规律。在12.5 W电功率的蓝光激光(455 nm)激发下,当荧光粉/玻璃质量比例为1∶4、535 nm/660 nm荧光粉质量比为9∶1时,可产生色温为5500 K、显色指数达92的高显指白光PiGF。该结果表明PiGF在高显指、白光激光照明领域具有极大的应用价值。

In this paper,by the way of mixing glass powder with yellow-green(535-550 nm)and red(660 nm)-emitting phosphors,and then coated on a sapphire wafer by screen-printing,the PiG film(Phosphors in glass flim,PiGF)with white light and high CRI is successfully prepared at a lower sintering temperature.The effects of different ratios of glass/phosphor and G/R phosphors(535 nm/660 nm)on PiGF's CCT,CRI,luminous efficiency(LE),etc.are systematically studied.The results show that the prepared PiGF can generate white light with a CCT of 5500 K and a high CRI of 92,when the mass ratios of phosphor/glass powder and G/R phosphor are fixed at 1∶4 and 9∶1,respectively,under the excitation of blue laser diodes(LD,455 nm)with an electric power of about 12.5 W.The results show that PiGF has great practical application in high CRI and white light laser-driven lighting.