【摘要】 研究了胶体固化温度对高性能量子点白光LED的光学性能的影响。首先运用一种新结构的光转换材料量子点-介孔硅微球,将其与荧光粉和硅胶共混形成荧光胶体,点涂到蓝光芯片上形成一种新型的量子点转换LED。相比传统的LED,这种新型LED的光效提升56%,显色指数Ra达96,在20~400 mA电流驱动下Ra维持在92以上。随后分析胶体固化温度对其光学性能的影响,并分析了物理机制。结果表明:在100℃固化时光效和Ra衰减均较严重;60℃固化时光效衰减很小,Ra的衰减约为100℃时的1/2。衰减的原因是固化积累的热量影响了量子点本身的性能,从而影响光功率大小,最终导致光效和Ra的衰减。更多还原

【Abstract】 In order to investigating the effect of heat on quantum dots(QDs)-converted light-emitting diodes(LEDs)and pursuing the excellent performance of QDs-converted LEDs, Quantum dotsmesoporous silica(QDMS)was prepared to mix with phosphor and silica resin,which was packaged onto a blue chip,forming a new type of QDs-converted LED.The light conversion efficiency(LCE)and color rendering index(CRI)of the new QDs-converted LED and traditional phosphor-converted LED were respectively measured and compared.The impact of changing current on the performance of the new type of LED was explored.Finally,the light power of the new type of LED before and after solidification were measured,which was solidified respectively in 100℃and 60℃.Results suggested that the LCE of the new type of LED reached 110lm·W-1,improved by about 56% relative to phosphor-converted LED,CRI attained 96(maximum is 100)and remained above 92 driven by current varing from 20 to 400mA,which demonstrated that the new type of QDs-converted LED possess obvious advantages compared to the traditional phosphor-converted LED.The decline of the LCE and CRI through solidification of the newtype of LED solidified under 60℃ were approximately half of that under 100℃,which revealed that heat transfer must be considered carefully during the fabrication of QDs-converted LED.更多还原