Very-High Temperature (200 degrees C) and High-Speed Operation of Cascade GaN-Based Green Light-Emitting Diodes With an InGaN Insertion Layer

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/52008

Title:	Very-High Temperature (200 degrees C) and High-Speed Operation of Cascade GaN-Based Green Light-Emitting Diodes With an InGaN Insertion Layer
Authors:	Shi,JW;Huang,HW;Kuo,FM;Sheu,JK;Lai,WC;Lee,ML
Contributors:	電機工程學系
Keywords:	OPTICAL-FIBER;PERFORMANCE;LEDS
Date:	2010
Issue Date:	2012-03-28 10:13:10 (UTC+8)
Publisher:	國立中央大學
Abstract:	We demonstrate a novel type of linear cascade green light-emitting diode (LED) arrays as a light source for in-car or harsh environment plastic optical fiber (POF) communications. To further enhance its dynamic and static performance, an InGaN layer is inserted between an n-type GaN cladding layer and InGaN-GaN multiple quantum wells as an efficient current spreading layer. Compared with the control device without that layer, our three-LED cascade array demonstrates a smaller turn-on voltage (9.3 versus 11 V at 20 mA) and a larger output power (25.5 versus 22.5 mW at 180 mA), corresponding to an enhancement of around 31% in wall-plug efficiency. Furthermore, under the constant voltage bias of an in-car battery (12 V), our three-LED array exhibits an electrical-to-optical 3-dB bandwidth (100 versus 40 MHz) performance superior to that of the control device. Even under high-temperature dynamic operation, we observe that the InGaN insertion layer gives strong enhancement of modulation speed with negligible degradation of the output power, unlike the red resonant-cavity LEDs conventionally used for POF. We achieve 200-Mb/s error-free transmission at 200 degrees C which is the highest operation temperature among all the reported high-speed LEDs.
Relation:	IEEE PHOTONICS TECHNOLOGY LETTERS
Appears in Collections:	[Department of Electrical Engineering] journal & Dissertation

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