TY - JOUR
T1 - Very-high temperature (200°C) and high-speed operation of cascade GaN-based green light- Emitting diodes with an InGaN insertion layer
AU - Shi, Jin Wei
AU - Huang, H. W.
AU - Kuo, F. M.
AU - Sheu, J. K.
AU - Lai, W. C.
AU - Lee, M. L.
N1 - Funding Information:
Manuscript received December 24, 2009; revised April 05, 2010; accepted April 19, 2010. Date of publication May 06, 2010; date of current version June 23, 2010. This work was sponsored by the National Science Council of Taiwan under Grant NSC-96-2221-E-008-106-MY3. J.-W. Shi, H.-W. Huang, and F.-M. Kuo are with the Department of Electrical Engineering, National Central University, Taoyuan 320, Taiwan (e-mail: [email protected]). J.-K. Sheu and W.-C. Lai are with the Institute of Electro-Optical Science and Engineering, National Cheng-Kung University, Tainan 701, Taiwan. M. L. Lee is with Department of Electro-Optical Engineering, Southern Taiwan University, Tainan County 71001, Taiwan. Color versions of one or more of the figures in this letter are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/LPT.2010.2049259
PY - 2010
Y1 - 2010
N2 - 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 InGaNGaN 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 °C which is the highest operation temperature among all the reported high-speed LEDs.
AB - 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 InGaNGaN 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 °C which is the highest operation temperature among all the reported high-speed LEDs.
KW - Cascade
KW - GaN
KW - light-emitting diodes (LEDs)
UR - http://www.scopus.com/inward/record.url?scp=77954008270&partnerID=8YFLogxK
U2 - 10.1109/LPT.2010.2049259
DO - 10.1109/LPT.2010.2049259
M3 - 期刊論文
AN - SCOPUS:77954008270
SN - 1041-1135
VL - 22
SP - 1033
EP - 1035
JO - IEEE Photonics Technology Letters
JF - IEEE Photonics Technology Letters
IS - 14
M1 - 5460921
ER -