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Enhancement of optical gain in Li:CdZnO/ZnMgO quantum well lasers
Affiliation:1. Quantum-functional Semiconductor Research Center, Dongguk University, Republic of Korea;2. Department of Electronics Engineering, Catholic University of Daegu, Republic of Korea;3. Institute of Quantum Information Processing and Systems, University of Seoul, Republic of Korea;4. Department of Physics, Chungnam National University, Republic of Korea;1. School of Electrical Engineering, Hanyang University, 55 Hanyangdeahak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea;2. Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea;3. IV Works Co., Ltd., 10-27 Expo-ro 339beon-gil, Daejeon 34122, Yuseong-gu, Republic of Korea;1. Electron Microscopy Research Center, Korea Basic Science Institute, 169-148 Gwahangno, Yuseong-gu, Daejeon 34133, Republic of Korea;2. Department of Physics, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, Republic of Korea;3. Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, CA 92521, USA;1. State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China;2. College of Information and Control Engineering, China University of Petroleum (East China), Qingdao 266580, China;1. Sungkyunkwan Advanced Institute of Nanotechnology (SAINT) and Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea;2. Department of Physics, Chungnam National University, Daejeon 34134, Republic of Korea;1. Institute of Quantum Systems, Chungnam National University, Daejeon 305-764, Republic of Korea;2. Department of Physics, Chungnam National University, Daejeon 305-764, Republic of Korea;1. Department of Physics, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea;2. Department of Information and Communications, Joongbu University, Chungnam 132-940, South Korea;3. School of Electrical and Computer Engineering, Hanyang University, Ansan 425-791, South Korea
Abstract:The CdZnO/ZnMgO QW structure with high Cd composition is found to have smaller optical gain because the strain-induced piezoelectric polarization and the spontaneous polarization in the well increase with the inclusion of Cd. The internal field is reduced due to the additional polarization of opposite direction by Li in the CdZnO/ZnMgO QW structure. These results show that Li:CdZnO-based QW lasers are promising candidates for optoelectric applications in visible and UV regions.
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