Effect of indium pre-flow on wavelength shift and crystal structure of deep green light emitting diodes

Rais, Shamsul Amir Abdul and Hassan, Zainuriah and Abu Bakar, Ahmad Shuhaimi and Abd Rahman, Mohd Nazri and Yusuf, Yusnizam and Taib, Muhamad Ikram Md and Sulaiman, Abdullah Fadil and Hussin, Hayatun Najiha and Ahmad, Mohd Fairus and Norizan, Mohd Natashah and Nagai, Keiji and Akimoto, Yuka and Shoji, Dai (2021) Effect of indium pre-flow on wavelength shift and crystal structure of deep green light emitting diodes. Optical Materials Express, 11 (3). pp. 926-935. ISSN 2159-3930, DOI https://doi.org/10.1364/OME.413417.

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To produce a deep green (530 nm-570 nm) LED, the suitable indium (In) composition in the InxGa1-xN/GaN multi-quantum well (MQW) structure is crucial because a lower indium composition will shift the wavelength of emission towards the ultraviolet region. In this paper, we clarify the effects of an indium-rich layer to suppress such blue shifting, especially after the annealing process. According to characterizations by the uses of XRD and TEM, narrowing of the MQW layer was observed by the indium capping, while without the capping, the annealing results in a slight narrowing of MQW on the nearest layer to the p-type layer. By adding an indium capping layer, the blue shift of the photoluminescence was also suppressed and a slight red shift to keep green emission was observed. Such photoluminescence properties were consistent with the tiny change of the MQW as seen in the XRD and TEM characterizations. (c) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Item Type: Article
Funders: Dynamic Alliance for Open Innovation Bridging Human, Environmental and Materials from MEXT, Universiti Malaya [Grant No: RP039A-18AFR], Ministry of Education, Malaysia [Grant No: 203/CINOR/6720013 & LR001A-2016A]
Uncontrolled Keywords: Indium pre-flow; Deep green LED; Ultraviolet region; Annealing process
Subjects: R Medicine > RE Ophthalmology > Ophthalmology
Divisions: Faculty of Education
Faculty of Science
Depositing User: Ms Zaharah Ramly
Date Deposited: 27 May 2022 01:47
Last Modified: 27 May 2022 01:47
URI: http://eprints.um.edu.my/id/eprint/34554

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