LED柔性照明及显示用超弹性柔性荧光膜

摘要

Flexible LEDs have attracted significant interest in recent years for lighting and display applications. We present a polydimethylsiloxane based phosphor film that is capable of high elasticity and flexibility while actively emit-ting light. It not only exhibits good thermal stability in a wide range of -50-230 ℃, but also retains the optical properties as raw phosphors. The prepared transparent PDMS thin film and the corresponding phosphor film enable complete flexibility and elasticity, the largest elongation is up to 400% and 275%, respectively. Besides, white LEDs were fabricated using prepared YAG-doped phosphor film, showing average Tc of 6925 K, CRI of 71 and mean luminous efficiency of 115. 7 lm/W. Furthermore, the proposed photoluminescent films in two colors and a flexible 3 × 3 LED array glowing with three colors were fabricated using thin elastic and transparent rubber and subjected to stretching, rolling and folding to demonstrate their promising use in flexible lighting and display applications.%柔性LED是近年来照明及显示领域研究的热点之一.本文提出了一种新的基于有机硅胶(PDMS)制备的兼具超弹性和柔性的荧光薄膜,它不仅在-50~230℃这一较宽的温度范围内展现了良好的热稳定性,还保持了原料荧光粉的光学性能.所制备的透明PDMS基质膜和相应的荧光膜具有完全的柔性和超弹性,其最大伸长率分别高达400%与275%.此外,采用所制掺YAG荧光膜和普通商用1 W蓝光芯片简单封装的白光LED灯珠满足日常白光照明的应用要求,呈现出约6925 K的平均色温,约71的平均显色指数,115.7 lm/W左右的平均发光效率.最后,基于所提出荧光膜成膜工艺而制备的三色3×3柔性阵列显示,可以轻易被拉伸、卷曲和折叠,显示了它在柔性照明及显示器件方面具有应用价值和潜力.