Enhanced light emission from AlGaN/GaN multiple quantum wells using the localized surface plasmon effect by aluminum nanoring patterns
We investigate the localized surface plasmon (LSP) effect by Al nanorings on the AlGaN/GaN multiple quantum well (MQW) structure emitting at 365 nm. For this experiment, first, the size of Al nanorings is optimized to maximize the energy transfer (or coupling) between the LSP and MQW using the silica nanospheres. Then, the Al nanorings with an outer diameter of 385 nm, which exhibit a strong absorption peak in the near-ultraviolet region, are applied to the top surface of the AlGaN/GaN MQW. The photoluminescence (PL) intensity of the MQW structure with Al nanorings increased by 227% at 365 nm compared to that without Al nanorings. This improvement is mainly attributed to an enhanced radiative recombination rate in the MQWs through the energy-matched LSPs by the temperature-dependent PL and time-resolved PL analyses. The radiative lifetime was about two times shorter than that of the structure without Al nanorings at room temperature. In addition, the measured PL efficiency at room temperature of the structure with Al nanorings was 33%, while that of the structure without Al nanorings was 19%, implying that LSP-QW coupling together with the nanoring array pattern itself played important roles in the enhancement.
基金项目：National Research Foundation of Korea (NRF)10.13039/501100003725 (2016R1A3B 1908249).
Byeong Ryong Lee：School of Electrical Engineering, Korea University, Anam-ro 145, Seongbuk-gu, Seoul 02841, South Korea
Min Ho Jang：Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
Hyun Chul Park：Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
Yong Hoon Cho：Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
Tae Geun Kim：School of Electrical Engineering, Korea University, Anam-ro 145, Seongbuk-gu, Seoul 02841, South Korea
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Kyung Rock Son, Byeong Ryong Lee, Min Ho Jang, Hyun Chul Park, Yong Hoon Cho, and Tae Geun Kim, "Enhanced light emission from AlGaN/GaN multiple quantum wells using the localized surface plasmon effect by aluminum nanoring patterns," Photonics Research 6(1), 30 (2018)