Angle resolved photoluminescence of nanostructured blue InGaN/GaN light emission diode

• Main Authors: Yao-Lin Tsai, 蔡曜璘
• Other Authors: Chih-Ming Wang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/95470256726178024790

碩士 === 國立東華大學 === 光電工程研究所 === 98 === In this thesis, we investigated the periodic structure of sub-micro grating in InGaN LEDs and modify extraction effect and changes in light patterns of GaN LED by studying the sub-micro grating structure. To measure the distribution of emission spectrum and light field pattern in the periodic structure of InGaN with metallic thin film, we used photoluminescence (PL) and angle-resolved photoluminescence (ARPL) measuring system. The polarizer was setting between incident end and receiver end of laser and measured in PS mode and SP mode. In the distribution of light field pattern, we discovered the diffraction pattern that result from laser, which pass through periodic grating structure at perpendicular incident to the back side of GaN LED. The sub-micro grating destroyed the wave guide-mode in GaN and made the light within LED to be extracted out and improved the extraction efficiency.As measuring at period of 0.75