Liu Hongmei, Tian Junjie, Sun Honghao, Xu Qian, Yu Jinyan, Yao Qing
School of Mechanical Engineering, Nantong University, Nantong 226019, China.
School of Transportation and Civil Engineering, Nantong University, Nantong 226019, China.
Materials (Basel). 2022 Jul 3;15(13):4667. doi: 10.3390/ma15134667.
Phosphors-in-glass (PiGs) regarded as a promising phosphor-converter for white light emitting diodes (WLEDs) is being researched widely. However, there are few reports on the effect of changing the shape of PiGs on the color rendering index (CRI) and heat dissipation of WLEDs. In this paper, gel casting with Isobam was first attempted in preparing special-shaped PiGs successfully. It exhibited that 76 wt.% was the optimum solid content based on the rheological properties of slurry and the shrinkage of green bodies. The sintering rate should be kept at a low speed and glass transition temperature (Tg) of glass powders must be higher than sublimation temperatures (Ts) of APS and Isobam. The CRI of PiGs was increased by about 27% after changing the shape of PiGs from cylinder to dome. Most importantly, operating temperature also reduced effectively the increase of the surface area of PiGs. Therefore, changing the shape of PiGs by gel casting with Isobam is a creative way for high-power WLEDs lighting.
玻璃荧光体（PiGs）被认为是一种很有前途的用于白光发光二极管（WLEDs）的荧光体转换器，目前正在被广泛研究。然而，关于改变PiGs形状对WLEDs显色指数（CRI）和散热的影响的报道很少。在本文中，首次尝试采用异丁烯酸甲酯凝胶浇铸法成功制备了异形PiGs。基于浆料的流变性能和生坯的收缩率，结果表明76 wt.%是最佳固体含量。烧结速率应保持在低速，玻璃粉末的玻璃化转变温度（Tg）必须高于APS和异丁烯酸甲酯的升华温度（Ts）。将PiGs的形状从圆柱体变为圆顶形后，PiGs的CRI提高了约27%。最重要的是，工作温度也有效地降低了PiGs表面积的增加。因此，采用异丁烯酸甲酯凝胶浇铸法改变PiGs的形状是一种用于高功率WLEDs照明的创新方法。
