Trialkoxysilyl terminal groups were directly introduced into fluorescent organic dye molecules by consecutive allylation and hydrosilation reactions; the derivatized dye molecules were then successfully embedded into silica nanoparticles by the Stöber method. Those fluorescent silica nanoparticles (FSNPs) had emission colors corresponding to each fluorescent organic dye used (yellowish-green and red) and showed excellent thermal and photochemical stabilities. A white light-emitting diode (WLED) was fabricated by combining the FSNP/silicone encapsulant composite incorporated with FSNPs having yellowish-green and red emission with a blue InGaN LED (BLED). The resulting three-color RGB FSNP-LED exhibited a good color rendering index (CRI), Ra 86.7, at the correlated color temperature of 5452.6 K and CIE coordinates of (0.3334, 0.3360), indicating that the combination of highly fluorescent silica nanoparticles with LEDs can offer a promising solution for white light sources with high color rendering properties.
通过连续的烯丙基反应和氢
硅烷化反应,三烷氧基
硅烷末端基团被直接引入到荧光有机
染料分子中;然后,通过Stöber方法成功地将衍生化的
染料分子嵌入到
硅氧烷纳米粒子中。这些荧光
硅氧烷纳米粒子(FSNPs)发出的颜色与所使用的每种荧光有机
染料相对应(黄色绿色和红色),并显示出优异的热稳定性和光
化学稳定性。通过将发出黄色绿色和红色的FSNP与蓝色InGaN LED(BLED)结合,制造了一个白光发射二极管(WLED)。最终得到的三色RGB FSNP-LED在相关色温5452.6 K和CIE坐标(0.3334, 0.3360)下,展现出良好的显色指数(CRI),Ra 86.7,表明高荧光
硅氧烷纳米粒子与LED的结合可以为具有高显色特性的白光源提供一种有前景的解决方案。