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Open AccessArticle

Study on Modulation Bandwidth and Light Extraction Efficiency of Flip-Chip Light-Emitting Diode with Photonic Crystals

by Hong Wang 1,2,3,*, Ming Zhong 1,3, Lijun Tan 2,3, Wei Shi 1,3 and Quanbin Zhou 2,3
1
Engineering Research Center for Optoelectronics of Guangdong Province, School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
2
Guangdong Provincial Engineering Laboratory for Wide Bandgap Semiconductor Materials and Devices, School of Electronics and Information Engineering, South China University of Technology, Guangzhou 510640, China
3
Zhongshan Institute of Modern Industrial Technology, South China University of Technology, Zhongshan 528437, China
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(11), 767; https://doi.org/10.3390/mi10110767
Received: 11 October 2019 / Revised: 3 November 2019 / Accepted: 9 November 2019 / Published: 11 November 2019
(This article belongs to the Special Issue Nanostructured Light-Emitters)
In this study, the photonic crystal structure is employed to increase both the light extraction efficiency and the modulation bandwidth of flip-chip GaN-based light-emitting diodes (LEDs). The finite difference time domain method is utilized to investigate the influence of structure of photonic crystals on the Purcell factor and light extraction efficiency of flip-chip GaN-based LEDs. Simulation results show that the modulation bandwidth is estimated to be 202 MHz at current densities of 1000 A/cm2. The experimental result of modulation bandwidth is in accord with the simulation. The optical f-3dB of the device achieves 212 MHz at current densities of 1000 A/cm2 and up to 285 MHz at current densities of 2000 A/cm2. This design of photonic crystal flip-chip LED has the potential for applications in high-frequency visible light communication. View Full-Text
Keywords: visible light communication; photonic crystals; flip-chip LED; Purcell effect; light extraction efficiency visible light communication; photonic crystals; flip-chip LED; Purcell effect; light extraction efficiency
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Wang, H.; Zhong, M.; Tan, L.; Shi, W.; Zhou, Q. Study on Modulation Bandwidth and Light Extraction Efficiency of Flip-Chip Light-Emitting Diode with Photonic Crystals. Micromachines 2019, 10, 767.

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