Effect of radiative and nonradiative energy transfer processes of light-emitting diodes combined with quantum dots
Wen-Hao Chiang1, Yu-Hsiang Chang1, Chien-Chung Lin2
1Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, 10639, Taiwan.
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.
Related Concept Videos
Photoluminescence: Fluorescence and Phosphorescence
A pair of electrons in a...
Deactivation Processes: Jablonski Diagram
Photoluminescence: Applications
Photoreceptors and Visual Pathways
Molecular Spectroscopy: Absorption and Emission
Interaction of EM Radiation with Matter: Spectroscopy


