Kamarulzaman, Kamarul Alif and Ameera, Anuar and Shuhaimi, Ahmad and Hongjian, Li and Alias, Ezzah Azimah and Samsudin, Muhammad Esmed Alii and Zainal, Norzaini
(2016)
Characteristic Enrichment of the Blue LED by MOCVD on
Patterned Sapphire (0 0 0 1) Substrate.
In: 3rd Meeting of Malaysia Nitrides Research Group (MNRG 2016).
Abstract
Blue light-emitting diodes (LEOs) with an lnGaN multi-quantum well (MQW) structure were fabricated on
a patterned sapphire substrate (PSS) using a single growth process of metal organic chemical vapor
deposition (MOCVO). The electrical and optical properties of these LEOs were investigated. The crystal
quality of epitaxial GaN film was improved by using the PSS structure. At 20 mA injection current, the
peak wavelength and the full-width at half-maximum of the electroluminescence spectra of PSS were
451 nm and 22 nm, respectively. The MOW optical power and operating voltage measured was about
5.1 V and 4.65 mW, respectively. The external quantum efficiency (EQE) was recorded at 39.3%. This
significant increase resulted from the improvement of the epitaxial quality of the lnGaN/GaN epilayers
and the improvement of the light extraction efficiency through patterned sapphire substrates.
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