Optical polarization characteristics of light emission from sidewalls of primary-color light-emitting diodes
Optical polarization characteristics of light emission from sidewalls of primary-color light-emitting diodes
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原色发光二极管侧壁出射光的偏振特性
DOI：
10.1088/0268-1242/23/7/072001
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
S. Denbaars
中科院分区：
文献类型：
--
作者：
H. Masui;N. Fellows;S. Nakamura;S. Denbaars
本通讯报告了一项关于发光二极管(LED)芯片侧壁偏振光发射的研究，该研究将在彩色显示应用方面产生兴趣，例如液晶显示器(LCD)背光。利用共聚焦显微镜对市售三原色LED管芯进行了偏振特性表征。AlInGaP红色LED管芯(立方体形状)发射偏振光，偏振比为0.47。研究发现，InGaN基蓝光(蓝宝石衬底)和绿光(碳化硅衬底)LED管芯的外延层侧面发射偏振比高达0.9。这些结果确保了商用LED管芯用于LCD背光实验的潜力。讨论了改善偏振特性的方法。
The present communication reports a study on polarized light emission from sidewalls of light-emitting-diode (LED) dies with future interest in color display applications, e.g., liquid-crystal display (LCD) backlighting. Commercial LED dies with three primary colors were subjected to polarization characterization via a confocal microscope. AlInGaP red LED dies (cube shape) were shown to emit polarized light with a polarization ratio of 0.47. InGaN-based blue (sapphire substrate) and green (SiC substrate) LED dies were revealed to possess polarization ratios as high as 0.9 on side emission from epitaxial layers. These results ensure the potential of commercially available LED dies for LCD backlighting experiments. Discussions were made on improvement in polarization characteristics.