Directional light extraction enhancement from GaN-based film-transferred photonic crystal light-emitting diodes
Directional light extraction enhancement from GaN-based film-transferred photonic crystal light-emitting diodes
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DOI：
10.1063/1.3106109
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发表时间：
2009-03
影响因子：
4
通讯作者：
Chun‐Feng Lai;C. Chao;H. Kuo;H. Yen;Chia-En Lee;W. Yeh
中科院分区：
文献类型：
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作者：
Chun‐Feng Lai;C. Chao;H. Kuo;H. Yen;Chia-En Lee;W. Yeh
在 GaN 基薄膜转移光子晶体 (PhC) 发光二极管 (FTLED) 中对远场图案的方向性和收集锥体中的光提取增强进行了实验研究。角度分辨测量通过导模提取揭示了远场分布中的方向分布和方位各向异性。根据布拉格衍射理论和自由光子能带结构取得了良好的一致性。根据测量的三维远场图案，获得了 PhC FTLED 与非 PhC FTLED 在收集锥角内的光增强。在 ±20° 收集锥中，准直 PhC FTLED 收集的光增强了约 2.4 倍。
Experimental investigation of the directionality in the far-field pattern and light extraction enhancement in collected cone were performed in GaN-based film-transferred photonic crystal (PhC) light-emitting diodes (FTLEDs). Angular-resolved measurement revealed directional profile and azimuthal anisotropy in the far-field distribution with guided modes extraction. Good agreement according to Bragg’s diffraction theory and free photon band structure were achieved. The light enhancement in PhC FTLEDs compared to non-PhC FTLEDs within the collection cone angle was obtained according to measured three-dimensional far-field patterns. In a ±20° collection cone, collected light was enhanced by a factor of ∼2.4 for the collimated PhC FTLED.