Oh Jeong Rok, Cho Sang-Hwan, Park Hoo Keun, Oh Ji Hye, Lee Yong-Hee, Do Young Rag
Department of Chemistry, Kookmin University, Seoul 136-702, Korea.
Opt Express. 2010 May 24;18(11):11063-72. doi: 10.1364/OE.18.011063.
This paper reports the possibility of a facile optical structure to realize a highly efficient monochromatic amber-emitting light-emitting diode (LED) using a powder-based phosphor-converted LED combined with a long-wave pass filter (LWPF). The capping of a blue-reflecting and amber-passing LWPF enhances both the amber emission from the silicate amber phosphor layer and the color purity due to the blocking and recycling of the pumping blue light from the InGaN LED. The enhancement of the luminous efficacy of the amber pc-LED with a LWPF (phosphor concentration 20 wt%, 39.4 lm/W) is 34% over that of an amber pc-LED without a LWPF (phosphor concentration 55 wt%, 29.4 lm/W) at 100 mA and a high color purity (>96%) with Commission International d'Eclairage (CIE) color coordinates of x=0.57 and y=0.42.
本文报道了一种简便的光学结构的可能性，该结构利用基于粉末的荧光粉转换发光二极管（LED）与长波通滤波器（LWPF）相结合，实现高效单色琥珀色发光二极管（LED）。蓝色反射和琥珀色透过的LWPF的覆盖，由于来自InGaN LED的泵浦蓝光的阻挡和再循环，增强了硅酸盐琥珀色荧光粉层的琥珀色发射以及色纯度。在100 mA时，带有LWPF（荧光粉浓度20 wt%，39.4 lm/W）的琥珀色pc-LED的发光效率比没有LWPF（荧光粉浓度55 wt%，29.4 lm/W）的琥珀色pc-LED提高了34%，且具有高色纯度（>96%），国际照明委员会（CIE）色坐标为x=0.57和y=0.42。
