Correlative Micro‐Photoluminescence Study on Hybrid Quantum‐Well InGaN Red Light‐Emitting Diodes

IF 1.5 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER Physica Status Solidi B-basic Solid State Physics Pub Date : 2024-04-26 DOI:10.1002/pssb.202400036

Zhaozong Zhang, Ryota Ishii, Kanako Shojiki, Mitsuru Funato, Daisuke Iida, Kazuhiro Ohkawa, Yoichi Kawakami

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Abstract

To investigate nonradiative recombination processes in indium gallium nitride (InGaN)‐based red light‐emitting diodes (LEDs), an InGaN‐based red LED with a hybrid quantum well (QW) structure consisting of red and blue single quantum wells (SQWs) is characterized by micro‐photoluminescence (μ‐PL) spectroscopy. The μ‐PL mapping of the red emission reveals numerous dark spots with various sizes and contrasts. Not only the red and blue (from a blue SQW) but green emission bands are observed at some red dark spots, suggesting that indium (In) segregation is one of the causes of nonradiative recombination in the red emission. Comparing the blue and green emission images to the red emission image reveals that the dark spots in the intensity map of the red emission can be classified into four types. Through this correlative analysis, the red dark spots associated with the dark areas in the intensity map of the blue emission are attributed to the major nonradiative recombination centers in the red emission.

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混合量子阱 InGaN 红色发光二极管的相关微光研究

为了研究基于氮化铟镓（InGaN）的红色发光二极管（LED）中的非辐射重组过程，我们利用微光致发光（μ-PL）光谱对一种基于氮化铟镓（InGaN）的红色 LED 进行了表征，该 LED 具有由红色和蓝色单量子阱（SQW）组成的混合量子阱（QW）结构。红色发射的 μ-PL 图显示了许多不同大小和对比度的暗点。在一些红色暗点上不仅能观察到红色和蓝色（来自蓝色 SQW）发射带，还能观察到绿色发射带，这表明铟（In）偏析是红色发射中非辐射重组的原因之一。将蓝色和绿色发射图像与红色发射图像进行比较，可以发现红色发射强度图中的暗点可分为四种类型。通过这种关联分析，与蓝色发射强度图中暗区相关的红色暗点可归因于红色发射中的主要非辐射重组中心。

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来源期刊

Physica Status Solidi B-basic Solid State Physics 物理-物理：凝聚态物理

CiteScore

3.30

自引率

6.20%

发文量

321

审稿时长

2 months

期刊介绍： physica status solidi is devoted to the thorough peer review and the rapid publication of new and important results in all fields of solid state and materials physics, from basic science to applications and devices. Being among the largest and most important international publications, the pss journals publish review articles, letters and original work as well as special issues and conference contributions. physica status solidi b – basic solid state physics is devoted to topics such as theoretical and experimental investigations of the atomistic and electronic structure of solids in general, phase transitions, electronic and optical properties of low-dimensional, nano-scale, strongly correlated, or disordered systems, superconductivity, magnetism, ferroelectricity etc.