Yao Yung-Chi, Hwang Jung-Min, Yang Zu-Po, Haung Jing-Yu, Lin Chia-Ching, Shen Wei-Chen, Chou Chun-Yang, Wang Mei-Tan, Huang Chun-Ying, Chen Ching-Yu, Tsai Meng-Tsan, Lin Tzu-Neng, Shen Ji-Lin, Lee Ya-Ju
Institute of Electro-Optical Science and Technology, National Taiwan Normal University, 88, Sec. 4, Ting-Chou Rd., Taipei, 116, Taiwan.
Advanced Lighting Technology Department, Green Energy and Environment Research Laboratories, Industrial Technology Research Institute (ITRI), Hsinchu 310, Taiwan.
Sci Rep. 2016 Mar 3;6:22659. doi: 10.1038/srep22659.
Enhancement of the external quantum efficiency of a GaN-based vertical-type light emitting diode (VLED) through the coupling of localized surface plasmon (LSP) resonance with the wave-guided mode light is studied. To achieve this experimentally, Ag nanoparticles (NPs), as the LSP resonant source, are drop-casted on the most top layer of waveguide channel, which is composed of hydrothermally synthesized ZnO nanorods capped on the top of GaN-based VLED. Enhanced light-output power and external quantum efficiency are observed, and the amount of enhancement remains steady with the increase of the injected currents. To understand the observations theoretically, the absorption spectra and the electric field distributions of the VLED with and without Ag NPs decorated on ZnO NRs are determined using the finite-difference time-domain (FDTD) method. The results prove that the observation of enhancement of the external quantum efficiency can be attributed to the creation of an extra escape channel for trapped light due to the coupling of the LSP with wave-guided mode light, by which the energy of wave-guided mode light can be transferred to the efficient light scattering center of the LSP.
研究了通过局域表面等离子体（LSP）共振与波导模光的耦合来提高基于GaN的垂直型发光二极管（VLED）的外部量子效率。为了通过实验实现这一点，将作为LSP共振源的Ag纳米颗粒（NPs）滴铸在波导通道的最顶层，该波导通道由水热合成的ZnO纳米棒覆盖在基于GaN的VLED顶部组成。观察到光输出功率和外部量子效率得到增强，并且增强量随着注入电流的增加而保持稳定。为了从理论上理解这些观察结果，使用时域有限差分（FDTD）方法确定了在ZnO纳米棒上装饰有和没有Ag NPs的VLED的吸收光谱和电场分布。结果证明，外部量子效率增强的观察结果可归因于由于LSP与波导模光的耦合而产生了一个额外的被困光逃逸通道，通过该通道，波导模光的能量可以转移到LSP的有效光散射中心。
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