Enhanced Performance of GaN-based Ultraviolet Light Emitting Diodes by Photon Recycling Using Graphene Quantum Dots oleh Tzu-Neng Lin, Svette Reina Merden Santiago, Chi-Tsu Yuan, Kuo-Pin Chiu, Ji-Lin Shen, Ting-Chun Wang, Hao-Chung Kuo, Ching-Hsueh Chiu, Yung-Chi Yao, Ya-Ju Lee