Characteristics of Polarized Electroluminescence from m-plane InGaN-based Light Emitting Diodes
Characteristics of Polarized Electroluminescence from m-plane InGaN-based Light Emitting Diodes
复制标题
DOI：
10.1143/jjap.46.l1010
复制
发表时间：
2007-10
影响因子：
1.5
通讯作者：
Hiroki Tsujimura;S. Nakagawa;K. Okamoto;H. Ohta
中科院分区：
文献类型：
--
作者：
Hiroki Tsujimura;S. Nakagawa;K. Okamoto;H. Ohta
研究了m平面ingan基蓝色发光二极管的极化电致发光（EL）。这些led由ZnO透明电极作为阳极，抛光的镜面状侧壁和抛光的带有反射镜的背面组成，以消除由于表面粗糙度引起的光散射。室温下的偏振比为0.80，与已知值相比比较高，认为比较接近真实值。光散射的减小是精确测量偏振发射的关键。测量了m-面、c-面和a-面三个不同平面的电子能谱。平行于m面偏振光谱的a面和c面侧壁发射的峰值能量与m面顶部发射的两个分量的峰值能量一致。最强的成分是E⊥c，第二强的成分是E∥c。与E∥c相比，E∥m分量极低。
Polarized electroluminescence (EL) from m-plane InGaN-based blue light emitting diodes (LEDs) has been investigated. These LEDs comprised a ZnO transparent electrode as an anode, polished mirror-like sidewalls, and a polished backside with the reflective mirror to remove the light scattering due to the surface roughness. The polarization ratio at room temperature was 0.80, which was relatively high compared to known values and was considered to be close to the true value. The reduction of the light scattering is essential for the accurate measurement of the polarized emission. The EL spectra from different three planes, i.e., m-, c-, and a-planes, have been measured. The peak energies of spectra polarized parallel to m-plane, emitted from a- and c-plane sidewalls, agree with the values of the two components emitted from top m-plane surface. The strongest component was E⊥c while the second strongest was E∥c. The E∥m component was extremely low compared with E∥c.