Abstract
Though light-emitting diodes (LEDs) combined with various color conversion techniques have been widely explored for VLC (visible light communication), E-O (electro-optical) frequency responses of devices with quantum dots (QDs) embedded within the nanoholes have rarely been addressed. Here we propose LEDs with embedded photonic crystal (PhC) nanohole patterns and green light QDs for studying small-signal E-O frequency bandwidths and large signal on–off keying E-O responses. We observe that the E-O modulation quality of PhC LEDs with QDs is better than a conventional LED with QDs when the overall blue mixed with green light output signal is considered. However, the optical response of only QD converted green light shows a contradictory result. The slower E-O conversion response is attributed to multi-path green light generation from both radiative and nonradiative energy transfer processes for QDs coated on the PhC LEDs.
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Details
1 Graduate Institute of Photonics and Optoelectronics, National Taiwan University, 10639, Taipei, Taiwan (GRID: grid.19188.39) (ISNI: 0000 0004 0546 0241)
2 Department of Electrical Engineering, National Taiwan University, 10639, Taipei, Taiwan (GRID: grid.19188.39) (ISNI: 0000 0004 0546 0241)
3 Department of Photonics and Graduate Institute of Electro-Optical Engineering, College of Electrical and Computer Engineer, National Yang Ming Chiao Tung University, 30010, Hsinchu, Taiwan (GRID: grid.260539.b) (ISNI: 0000 0001 2059 7017)