Oh Ji Hye, Oh Jeong Rok, Park Hoo Keun, Sung Yeon-Goog, Do Young Rag
Department of Chemistry, Kookmin University, Seoul 136-702, Korea.
Opt Express. 2011 May 9;19 Suppl 3:A270-9. doi: 10.1364/OE.19.00A270.
This study introduces innovative multi-chip white LED systems that combine an InGaN blue LED and green/red or green/amber/red full down-converted, phosphor-conversion LEDs (pc-LEDs). Efficient green, amber, and red full down-converted pc-LEDs were fabricated by simply capping a long-wave pass filter (LWPF) on top of LED packing associated with each corresponding powder phosphor. The principal advantage of this type of color-mixing approach in newly developed multi-chip white LEDs based on colored pc-LEDs is thought to be dynamic control of the chromaticity and better light quality. In addition, the color-mixing approach improves the low efficacy of green/amber LEDs in the "green gap" wavelength; reduces the wide color/efficacy variations of each primary LED with at different temperatures and currents; and improves the low color rendering indexes of the traditional color-mixing approach in red, green, and blue (RGB) multi-chip white LEDs.
本研究介绍了创新的多芯片白光LED系统，该系统将氮化铟镓蓝色LED与绿色/红色或绿色/琥珀色/红色全向下转换的磷光转换LED（pc-LED）相结合。通过简单地在与每种相应粉末磷光体相关的LED封装顶部覆盖一个长波通滤光片（LWPF），制造出了高效的绿色、琥珀色和红色全向下转换的pc-LED。在基于彩色pc-LED的新开发多芯片白光LED中，这种颜色混合方法的主要优点被认为是色度的动态控制和更好的光质量。此外，颜色混合方法提高了绿色/琥珀色LED在“绿色间隙”波长处的低效率；减少了每个原色LED在不同温度和电流下的宽颜色/效率变化；并改善了传统颜色混合方法在红、绿、蓝（RGB）多芯片白光LED中的低显色指数。
