Green gap in GaN-based light-emitting diodes: in perspective

M Usman, M Munsif, U Mushtaq, AR Anwar… - Critical Reviews in …, 2021 - Taylor & Francis
Significant progress has been made in the advancement of light-emitting devices in both the
blue and the red parts of the emission spectrum. However, the quantum efficiency of green …

Approaches for high internal quantum efficiency green InGaN light-emitting diodes with large overlap quantum wells

H Zhao, G Liu, J Zhang, JD Poplawsky, V Dierolf… - Optics express, 2011 - opg.optica.org
Optimization of internal quantum efficiency (IQE) for InGaN quantum wells (QWs) light-
emitting diodes (LEDs) is investigated. Staggered InGaN QWs with large electron-hole …

Perspective: Toward efficient GaN-based red light emitting diodes using europium doping

B Mitchell, V Dierolf, T Gregorkiewicz… - Journal of Applied …, 2018 - pubs.aip.org
While InGaN/GaN blue and green light-emitting diodes (LEDs) are commercially available,
the search for an efficient red LED based on GaN is ongoing. The realization of this LED is …

Analysis of internal quantum efficiency and current injection efficiency in III-nitride light-emitting diodes

H Zhao, G Liu, J Zhang, RA Arif… - Journal of Display …, 2013 - ieeexplore.ieee.org
Current injection efficiency and internal quantum efficiency (IQE) in InGaN quantum well
(QW) based light emitting diodes (LEDs) are investigated. The analysis is based on current …

Current injection efficiency induced efficiency-droop in InGaN quantum well light-emitting diodes

H Zhao, G Liu, RA Arif, N Tansu - Solid-State Electronics, 2010 - Elsevier
Current injection efficiency and its impact on efficiency-droop in InGaN single quantum well
(QW) based light-emitting diodes (LEDs) are investigated. The analysis is based on current …

Light extraction efficiency and radiation patterns of III-nitride light-emitting diodes with colloidal microlens arrays with various aspect ratios

XH Li, R Song, YK Ee, P Kumnorkaew… - IEEE Photonics …, 2011 - ieeexplore.ieee.org
The fabrication studies of silica/polystyrene (PS) colloidal microlens arrays with various
aspect ratios were performed on the III-nitride light-emitting diodes (LEDs). The use of …

Analysis of InGaN-delta-InN quantum wells for light-emitting diodes

H Zhao, G Liu, N Tansu - Applied Physics Letters, 2010 - pubs.aip.org
The design of InGaN-delta-InN quantum wells (QWs) leads to significant redshift for nitride
active region with large electron-hole wave function overlap (Γ e _ hh) and spontaneous …

III-nitride photonics

N Tansu, H Zhao, G Liu, XH Li, J Zhang… - IEEE Photonics …, 2010 - ieeexplore.ieee.org
The progress in III-Nitride photonics research in 2009 is reviewed. The III-Nitride photonics
research is a very active field with many important applications in the areas of energy …

Optical gain and laser characteristics of InGaN quantum wells on ternary InGaN substrates

J Zhang, N Tansu - IEEE Photonics Journal, 2013 - ieeexplore.ieee.org
The optical gain and threshold characteristics of InGaN quantum wells (QWs) on ternary
InGaN substrate emitting in green and yellow spectral regimes are analyzed. By employing …

Large optical gain AlGaN-delta-GaN quantum wells laser active regions in mid-and deep-ultraviolet spectral regimes

J Zhang, H Zhao, N Tansu - Applied Physics Letters, 2011 - pubs.aip.org
The gain characteristics of high Al-content AlGaN-delta-GaN quantum wells (QWs) are
investigated for mid-and deep-ultraviolet (UV) lasers. The insertion of an ultrathin GaN layer …