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Title: Voltage tunable wavelength LEDs
Authors: Soh, C.B.
Chua, S.J. 
Hartono, H.
Issue Date: 2008
Citation: Soh, C.B., Chua, S.J., Hartono, H. (2008). Voltage tunable wavelength LEDs. Physica Status Solidi (C) Current Topics in Solid State Physics 5 (6) : 2183-2185. ScholarBank@NUS Repository.
Abstract: We report on the growth and fabrication of a LED which emits light, tunable in color, as the injection current is increased from I = 1.0 mA to 40 mA. Two multiple quantum well (MQWs) structures, designated as A and B, are grown in the LEDs, with quantum dots embedded in MQWs B while MQWs A are conventional blue emitting quantum well layers. A broad photoluminescence spectrum ranging from 430 nm to 750 nm is measured, which is the result of spectral broadening attributed to the incorporation of quantum dots in the well layer of MQWs B coupled with the grading of Indium composition in the well of MQW B. This leads to a gradual change in the emission wavelength as the electronhole (e-h) pairs recombine at the different stacked layers to give a transition from red, yellow, green and cyan as injection current increases. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.
Source Title: Physica Status Solidi (C) Current Topics in Solid State Physics
ISSN: 18626351
DOI: 10.1002/pssc.200778526
Appears in Collections:Staff Publications

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