The assessment of emission mechanism in GaN-based nano-structures by scanning near-field optical microscopy

通过扫描近场光学显微镜评估 GaN 基纳米结构的发射机制

基本信息

  • 批准号:
    15206033
  • 负责人:
  • 金额:
    $ 25.79万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
  • 财政年份:
    2003
  • 资助国家:
    日本
  • 起止时间:
    2003 至 2005
  • 项目状态:
    已结题

项目摘要

The purpose of this project is to assess and/or control the radiative recombination processes in InGaN/GaN-based quantum wells by employing photoluminescence (PL) mapping with scanning near field optical microscopy (SNOM), by which dramatic improvement of emission efficiency as well as the extension of operatable wavelength can be achieved in emitters such as light emitting diodes (LEDs), laser diodes (LDs) and new phosphors. Our approach is to fabricate micro/nano structures for multi-wavelength lighting, to elucidate fundamental optical properties, and to make a positive feedback to future device structures. Main results are summarized as shown below.(1)We have developed the experimental technique by combining the SNOM-PL with atomic force microscopy (AFM), where the correlation was clearly revealed between dislocations and weak emission regions. Moreover, time-resolved PL measurements with this method showed the dynamical behavior of photo-generated carriers and/or excitons in potential fluctuations. It was found that the pathway to nonradiative recombination centers is effectively hindered by the compositional modulation around the dislocations, so that the carrier diffusion is spatially unisotropic process.(2)We have proposed the re-growth technique, where well-established c-oriented GaN is used as a seed. It has been demonstrated that the growth on c-oriented GaN patterned with a stripe along the [11^^-00] direction forms (0001), <112^^-2>, and <112^^-0> facets and that the QW on the <112^^-2> facet involves weaker electric fields and has a higher PL efficiency, compared with conventional c-oriented InGaN/GaN QWs. Moreover, rainbow color PL covering the entire visible range has been achieved from InGaN/GaN QWs on the <112^^-2> facets with a few micron-width.
本项目的目的是利用扫描近场光学显微镜(SNOM)的光致发光(PL)映射来评估和/或控制InGaN/ gan基量子阱中的辐射复合过程,通过该方法可以在发光二极管(led),激光二极管(ld)和新型荧光粉等发射器中实现发射效率的显着提高以及可操作波长的延长。我们的方法是制造用于多波长照明的微/纳米结构,阐明基本的光学性质,并对未来的器件结构做出积极的反馈。主要结果总结如下。(1)我们将SNOM-PL与原子力显微镜(AFM)相结合,开发了实验技术,其中位错与弱发射区之间的相关性被清楚地揭示出来。此外,用这种方法进行的时间分辨PL测量显示了光产生的载流子和/或激子在电位波动中的动力学行为。研究发现,位错周围的成分调制有效地阻碍了通往非辐射复合中心的路径,使得载流子扩散在空间上是一个各向同性的过程。(2)我们提出了再生技术,其中成熟的c取向氮化镓用作种子。研究表明,在沿[11^^-00]方向呈条纹图案的c取向GaN上生长形成(0001)、<112^^-2>和<112^^-0>面,并且与传统的c取向InGaN/GaN QW相比,<112^^-2>面上的QW涉及更弱的电场,具有更高的PL效率。此外,在<112^^-2>面的InGaN/GaN qw上,以几微米的宽度实现了覆盖整个可见范围的彩虹色PL。

项目成果

期刊论文数量(102)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Efficient radiative recombination from <1122>-oriented In_xGa_<1-x>N multiple quantum wells fabricated by the re-growth technique
通过再生长技术制造的<1122>取向In_xGa_<1-x>N多量子阱的高效辐射复合
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    K.Nishizuka;M.Funato;Y.Narukawa;T.Mukai;Y.Kawakami;Sg.Fujita
  • 通讯作者:
    Sg.Fujita
Indium Concentration on PL Spatial Inhomogeneity in InGaN Single Quantum Well Structures Detected by Original Low Cost Near-field Probes
通过原始低成本近场探针检测 InGaN 单量子阱结构中 PL 空间不均匀性的铟浓度
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    R.Micheletto;N.Yoshimatsu;A.Kaneta;Y.Kawakami;S.Fujita
  • 通讯作者:
    S.Fujita
Optically pumped lasing and gain formation properties in blue In_xGa_<1-x>N MQWs
蓝色 In_xGa_<1-x>N MQW 中的光泵激激光和增益形成特性
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    K.Kojima;A.Shikanai;K.Omae;M.Funato;Y.Kawakami;Y.Narukawa;T.Mukai;S.Fujita
  • 通讯作者:
    S.Fujita
Nano probing of the membrane dynamics of rat pheochromocytoma by near field optics
近场光学对大鼠嗜铬细胞瘤膜动力学的纳米探测
  • DOI:
  • 发表时间:
    2005
  • 期刊:
  • 影响因子:
    0
  • 作者:
    R.Piga;R.Micheletto;Y.Kawakami
  • 通讯作者:
    Y.Kawakami
Submicron-Scale Photoluminescence of InGaN/GaN Probed by Confocal Scanning Laser Microscopy
  • DOI:
    10.1143/jjap.43.839
  • 发表时间:
    2004-02
  • 期刊:
  • 影响因子:
    1.5
  • 作者:
    K. Okamoto;Jungkwon Choi;Y. Kawakami;M. Terazima;T. Mukai;S. Fujita
  • 通讯作者:
    K. Okamoto;Jungkwon Choi;Y. Kawakami;M. Terazima;T. Mukai;S. Fujita
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KAWAKAMI Yoichi其他文献

KAWAKAMI Yoichi的其他文献

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{{ truncateString('KAWAKAMI Yoichi', 18)}}的其他基金

Development of Key Technologies for the Multi-probe Spectroscopy based on Near-field Optics
基于近场光学的多探针光谱关键技术研究进展
  • 批准号:
    21226001
  • 财政年份:
    2009
  • 资助金额:
    $ 25.79万
  • 项目类别:
    Grant-in-Aid for Scientific Research (S)
Development of key technologies for the measurement of luminescence dynamics in the nano-space
纳米空间发光动力学测量关键技术开发
  • 批准号:
    18206002
  • 财政年份:
    2006
  • 资助金额:
    $ 25.79万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Study on nonradiative recombination mechanism in widegap semiconductors
宽禁带半导体非辐射复合机理研究
  • 批准号:
    12450011
  • 财政年份:
    2000
  • 资助金额:
    $ 25.79万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Basic Research for the Development of Laser Diode with Low-threshold Current Density Utilizing Large Oscillator Strength of Excitonic System
利用激子系统大振荡强度开发低阈值电流密度激光二极管的基础研究
  • 批准号:
    09450128
  • 财政年份:
    1997
  • 资助金额:
    $ 25.79万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)

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