Low parasitic carrier reservoir of AlGaN-based DUV-LED via controlled-polarization step-graded superlattice electron blocking layer for high luminescence lighting

Hairol Aman, Mohammad Amirul and Ahmad Noorden, Ahmad Fakhrurrazi and Daud, Suzairi and Abdul Kadir@Jaafar, Muhammad Zamzuri (2024) Low parasitic carrier reservoir of AlGaN-based DUV-LED via controlled-polarization step-graded superlattice electron blocking layer for high luminescence lighting. Physica Scripta, 99 (5). pp. 1-13. ISSN 0031-8949 E-ISSN 1402-4896

	PDF - Published Version Restricted to Registered users only Download (1MB) | Request a copy
Preview	PDF - Supplemental Material Download (243kB) | Preview

Abstract

Achieving high luminescence intensity of deep-ultraviolet light-emitting diode (DUV-LED) is generally performed through the implementation of electron blocking layer (EBL) on the chip’s epilayers. However, the issue of parasitic carrier reservoir that originated from the uncontrolled piezoelectric field polarization has restricted the performance of DUV-LED by reducing the radiative recombination in the active region. This work reports on the numerical computation analysis of the DUV-LED with different types of EBL designs which are reference EBL, conventional superlattice EBL and step-graded superlattice EBL. The analysis of the DUV-LED focuses on the band diagram, carrier concentration at the EBL interfaces, current density of the carrier in the active region, radiative recombination rates, and luminescence spectrum. Remarkably, it is found that the DUV-LED stepgraded superlattice EBL provides the polarization-controlled band diagram and emits 272 nm UVCwavelength in which it is superior in performance compared to the other structures, specifically in terms of its radiated intensity. The parasitic electron and hole reservoir have been reduced by 30% and 60%, respectively. The luminescence intensity was also enhanced by 11% compared with the reference EBL and the IQE obtained by the DUV-LED with step-graded superlattice EBL is 50.12%.

Item Type:	Article (Journal)
Uncontrolled Keywords:	deep-ultraviolet light-emitting diode, aluminium gallium nitride, polarization, electron blocking layer, luminescence, parasitic carrier reservoir
Subjects:	Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Chemistry
Depositing User:	Dr Ahmad Fakhrurrazi Ahmad Noorden
Date Deposited:	23 Aug 2024 11:59
Last Modified:	23 Aug 2024 11:59
URI:	http://irep.iium.edu.my/id/eprint/114024

Actions (login required)

View Item