Lee Gi Jung, Hong Seung Chan, Lee Jung-Gyun, Ko Jae-Hyeon, Park Taehee, Ko Young Wook, Lushnikov Sergey
School of Nano Convergence Technology, Nano Convergence Technology Center, Hallym University, Chuncheon 24252, Korea.
GLVISION Co., Ltd., Room 1034, 9-36 Supuran-gil, Siheung-si 14986, Korea.
Nanomaterials (Basel). 2022 Mar 27;12(7):1097. doi: 10.3390/nano12071097.
A new type of remote red quantum-dot (QD) component was designed and fabricated to improve the color-rendering properties of conventional white LED (light-emitting diode) lightings. Based on an optical simulation, the rectangular cavity-type QD cap was designed with an opening window on the top surface. Red QD caps were fabricated using a typical injection molding technique and CdSe/ZnS QDs with a core/shell structure whose average size was ~6 nm. Red QD caps were applied to conventional 6-inch, 15-W white LED downlighting consisting of 72 LEDs arrayed concentrically. The red QD caps placed over white LEDs enhanced the red components in the long-wavelength range resulting in the increase of the color rendering index (CRI) from 82.9 to 94.5. The correlated color temperature was tuned easily in a wide range by adopting various configurations consisting of different QD caps. The spatial and angular homogeneities were secured on the emitting area because QD caps placed over the white LEDs did not exhibit any substantial optical path length difference. The present study demonstrates that adopting QD caps in conventional LED lightings provides a flexible and efficient method to realize a high color-rendering property and to adjust correlated color temperature appropriately for a specific application.
为了改善传统白光发光二极管（LED）照明的显色特性，设计并制造了一种新型的远程红色量子点（QD）组件。基于光学模拟，设计了一种矩形腔型量子点帽，其顶表面有一个开口窗口。采用典型的注塑技术和平均尺寸约为6nm的核壳结构CdSe/ZnS量子点制造了红色量子点帽。将红色量子点帽应用于由72个同心排列的LED组成的传统6英寸、15W白色LED筒灯。放置在白色LED上方的红色量子点帽增强了长波长范围内的红色成分，导致显色指数（CRI）从82.9提高到94.5。通过采用由不同量子点帽组成的各种配置，可以在很宽的范围内轻松调节相关色温。由于放置在白色LED上方的量子点帽没有表现出任何显著的光程长度差异，因此在发光区域确保了空间和角度均匀性。本研究表明，在传统LED照明中采用量子点帽提供了一种灵活而有效的方法，可实现高显色特性并针对特定应用适当地调整相关色温。
