High-Speed Light-Emitting Diodes Emitting at 500 nm With 463-MHz Modulation Bandwidth

Author

Chien-Lan Liao ; Chong-Lung Ho ; Yung-Fu Chang ; Chi-Hung Wu ; Meng-Chyi Wu

Author_Institution

Inst. of Electron. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan

Volume

35

Issue

5

fYear

2014

fDate

May-14

Firstpage

563

Lastpage

565

Abstract

Light-emitting diode (LED) is one of the most important light sources due to its low power consumption and long lifetime. In this letter, we present the high-frequency characteristics of GaN-based green LEDs with different aperture diameters. In order to get higher current density, we use ring-shaped electrode to confine the current injection. Unlike conventional LEDs, we only use its natural feature to get a high modulation bandwidth. The LEDs investigated have a peak emission wavelength of 500 nm. The highest optical 3-dB modulation bandwidth is ~463 MHz at 50 mA for the 500-nm green GaN-based LED with an aperture diameter of 75 μm. It is the highest bandwidth yet reported for the green GaN-based LEDs. The LED also exhibits a relatively high output power of ~1.6 mW at 50 mA as compared with other high-speed LEDs. Such the LEDs can be applied to plastic optical fiber and visible light communication in the future.

Keywords

III-V semiconductors; current density; gallium compounds; light emitting diodes; wide band gap semiconductors; GaN; GaN-based green LED; LED; bandwidth 463 MHz; current 50 mA; current density; current injection; high-frequency characteristics; high-speed light-emitting diodes; modulation bandwidth; plastic optical fiber; ring-shaped electrode; size 75 mum; visible light communication; wavelength 500 nm; Apertures; Bandwidth; Current density; Frequency response; High-speed optical techniques; Light emitting diodes; Power generation; 3-dB modulation bandwidth; High-speed; green GaN-based LEDs; plastic optical fiber (POF); visible light communication (VLC); visible light communication (VLC).;

fLanguage

English

Journal_Title

Electron Device Letters, IEEE

Publisher

ieee

ISSN

0741-3106

Type

jour

DOI

10.1109/LED.2014.2304513

Filename

6786982