Ultraviolet Lasing of Sol–Gel-Derived Zinc Oxide Polycrystalline Films

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概要

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• The effect of post-annealing on sol–gel-derived ZnO films has been investigated. For these films, structural investigations including analyses of surface morphology and microstructures were carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Also, optical properties were determined by photoluminescence analysis, ellipsometry and optical pumping measurement. The XRD results indicate that the (002) peak will predominate with increasing annealing temperature. SEM images show that grain size increased with annealing temperature. Moreover, photoluminescence spectra revealed the enhancement in UV emission intensity with annealing temperature, which was attributed to an improvement in crystal quality. Room-temperature ultraviolet random lasing action was observed in the ZnO films. The threshold intensity for the lasing was estimated to be ${\sim}70$ kW/cm2. Furthermore, it was found that the formation of random laser action is affected by post-annealing, which is associated to the presence of a high-gain medium and efficient light scattering.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2006-04-30

著者

• Kuo Hao-chung

  Department Of Photonic And Institute Of Electro-optical Engineering National Chiao Tung University

• Wang Shing-chung

  Department Of Photonic And Institute Of Electro-optical Engineering National Chiao Tung University

• Kuo Shou-yi

  Instrument Technology Research Center National Applied Research Laboratories

• Lai Fang-i

  Department Of Electrical Engineering Yuan Ze University

• Cheng Chin-pao

  Department Of Mechatronic Technology National Taiwan Normal University

• Chen Wei-chun

  Instrument Technology Research Center National Applied Research Laboratories

• Wang Shing-Chung

  Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu, Taiwan

• Kuo Shou-Yi

  Instrument Technology Research Center, National Applied Research Laboratories, 20 R&D Road VI, Hsinchu Science Park, Hsinchu 300, Taiwan

• Lai Fang-I

  Department of Electronic Engineering, Ching Yun University, 229 Jianshing Road, Jungli City, Taoyuan 320, Taiwan

• Chen Wei-Chun

  Instrument Technology Research Center, National Applied Research Laboratories, 20 R&D Road VI, Hsinchu Science Park, Hsinchu 300, Taiwan

• Cheng Chin-Pao

  Department of Mechatronics Technology, National Taiwan Normal University, No. 162, Hoping E. Road, Section 1, Taipei 106, Taiwan

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