Add to BibSonomy
Abstract
InGaN-based micro-LEDs can detect and emit optical signals simultaneously, owing to their overlapping emission and absorption spectra, enabling color detection. In this paper, we fabricated a green InGaN-based micro-LED array with integrated emission and detection functions. On the back side of the integrated device, when the 80 $\mathrm{\mu}$m micro-LED emitted light, the 200 $\mathrm{\mu}$m LED could receive reflected light to accomplish color detection. The spacing between the 80 $\mathrm{\mu}$m and the 200 $\mathrm{\mu}$m micro-LEDs was optimized to be 1 mm to reduce the effect of the direct light transmitted through the n-GaN layer without reflection. The integrated device shows good detection performance for different colors and skin colors, even in a dark environment. In addition, light can be emitted from the top side of the device. Utilization of light from both sides of the integrated device provides the possibility of its application in display, communication, and detection on the different sides.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Xiang Gao, Yi Xu, Jinpeng Huang, Zelin Hu, Wenhui Zhu, Xiaoyan Yi, and Liancheng Wang
Opt. Lett. 46(11) 2666-2669 (2021)
Guoyi Tao, Siyuan Cui, Yuechang Sun, Ke Sun, Qianxi Zhou, and Shengjun Zhou
Opt. Lett. 48(16) 4292-4295 (2023)
Yongzhen Liu, Tianwen Xia, Aochen Du, Tao Liang, Zhengui Fan, Enguo Chen, Jie Sun, Qun Yan, and Tailiang Guo
Opt. Lett. 48(7) 1650-1653 (2023)