Study on the the optical blinking of InGaN materials by near-field optical microscope

• Project/Area Number: 24560014
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Applied materials science/Crystal engineering
• Research Institution: Yokohama City University
• Principal Investigator: MICHELETTO Ruggero 横浜市立大学, その他の研究科, 教授 (50397600)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2012: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
• Keywords: 結晶評価 / 点滅現象 / 光物性 / 量子光工学 / 点滅発光 / InGaN / Indium / Gallium / Nitride / 発光 / 不安定発光 / ab-initio / 光デバイス / Photoluminescence / 発光デバイス / Ab-Initio / シミュレーション / ホトルミネセンス / 近接場 / 評価方法

Outline of Final Research Achievements

This project had the main goal to solve the enigma of optical blinking in LED and other devices. This phenomena is present in Indium Gallium Nitrides LEDs and its causes were unknown. We could approach the problem experimentally and with the development of theoretical models. In these three years we could clarify what is the real cause of the blinking. The blinking is caused by the interference of thermal vibrations in the crystal lattice that alters the frequencies of a small amount. In this way we observe the blinking phenomena because crystal lattice structure is proportional to luminosity. Also we verified with very advance analysis with ab-initio methods that absorbed impure gas materials on the surface of the device may be responsible for the blinking. Besides these investigations, we also did a purely experimental approach with low-temperature and vacuum microscopy analysis with different gas to elucidate the influence on blinking (research paper in preparation).

Research Products

• [Journal Article] Electronic properties of substitutional impurities in InGaN monolayer quantum wells (2015)
  • Author(s): G. Alfieri, T. Tsutsumi and R. Micheletto
  • Journal Title: Applied Physics Letters Volume: 106 Issue: 19 Pages: 192102-192102
  • DOI: 10.1063/1.4919787
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Blinking in Photoluminescence of InGaN Devices is Caused by Slow Beating of THz Vibrations of the Quantum Well (2014)
  • Author(s): R. Micheletto, K. Oikawa and C. Feldmeier
  • Journal Title: Applied Mechanics and Materials Volume: 541-542 Pages: 253-257
  • DOI: 10.4028/www.scientific.net/amm.541-542.253
  • Peer Reviewed
• [Journal Article] Observation of lattice thermal waves interference by photoluminescence blinking of InGaN quantum well devices (2013)
  • Author(s): R. Micheletto, K. Oikawa, C. Feldmeier
  • Journal Title: Applied Physics Letters Volume: 103 Issue: 17 Pages: 172109-172109
  • DOI: 10.1063/1.4826088
  • Peer Reviewed
• [Journal Article] A Fast and Precise HOG-Adaboost Based Visual Support System Capable to Recognize Pedestrian and Estimate Their Distance (2013)
  • Author(s): T. Kishino, Sun Zhe, R. Micheletto
  • Journal Title: Lecture Notes in Computer Science Volume: 8158 Pages: 20-29
  • DOI: 10.1007/978-3-642-41190-8_3
  • ISBN: 9783642411892, 9783642411908
  • Peer Reviewed
• [Presentation] Study of (0001) InGaN SQW optical memory effect correlated to the increase of intense emission local domains by time-resolved photoluminescence and thermal and pressure dependence (2014)
  • Author(s): T. Tsutsumi, M. Funato, Y. Kawakami and R. Micheletto
  • Organizer: OaM 2014, Optics and Measurement International Conference
  • Place of Presentation: Liberec, Czech Republic
  • Year and Date: 2014-10-07 – 2014-10-10
• [Presentation] Surface exciton polaritons supported by a J-aggregated-dye/air interface (2014)
  • Author(s): K. Takatori, T. Okamoto, K. Ishibashi and R. Micheletto
  • Organizer: 応用物理学会秋季学術講演会
  • Place of Presentation: 北海道大学、札幌、日本
  • Year and Date: 2014-09-17 – 2014-09-20
• [Presentation] Emergence of Intelligent Behavior From a Minimalistic Stochastic Model for Robots (2014)
  • Author(s): Sun Zhe, R. Micheletto
  • Organizer: ISEEE 2014, International Conference on Information Science and Electronics Engineering
  • Place of Presentation: Sapporo city, Hokkaido, Japan
  • Year and Date: 2014-04-26 – 2014-04-28
• [Presentation] Investigation of DNA Modifications in a Soil Bacterium After Exposure to Organic and Inorganic Pollutants by LC-tandem Mass Spectrometry (2013)
  • Author(s): Kanaly, R. A., Micheletto, R., Maeda, A. H., Hamamura, N.
  • Organizer: American Society for Microbiology General Meeting 2013
  • Place of Presentation: Denver, Colorado, USA
• [Presentation] Software-aided Processing of DNA Adductomics Data Obtained by Liquid Chromatography Electrospray Ionization Tandem Mass Spectrometry (2013)
  • Author(s): Kanaly, R. A., Maeda, A. H., Hamamura, N., Micheletto, R.
  • Organizer: The XII International Congress of Toxicology (ICT2013)
  • Place of Presentation: Seoul, South Korea
• [Presentation] Blinking in Photoluminescence is caused by slow beating of THz vibration of the Quantum Well (2013)
  • Author(s): R. Micheletto, K. Oikawa, C. Feldmeier
  • Organizer: The 4 th International Conference on Advanced Materials Research ( ICAMR 201 4 )
  • Place of Presentation: Macau, China
• [Presentation] The observation of nano and micro scaled optical blinking phenomena in the emission of InGaN LEDs: characterization and models (2012)
  • Author(s): Ruggero Micheletto
  • Organizer: 13th annual LEDs 2012
  • Place of Presentation: S. Diego, USA, Hilton S. Diego
• [Presentation] InGaN デバイスの点滅発行現象の研究
  • Author(s): ミケレット・ルジェロ 、後藤 秀樹
  • Organizer: ナノオプティクス研究討論会第20回記念シンポジウム
  • Place of Presentation: 東京、慶応大学日吉キャンパス
• [Presentation] プラズモンック結晶における表面プラズモンとエキシトンとの強結合の観測
  • Author(s): 岡本 隆之 、鷹取 賢太郎 、及川 虎太郎 、ミケレット ・ルジェロ
  • Organizer: ナノオプティクス研究討論会第20回記念シンポジウム
  • Place of Presentation: 東京、慶応大学日吉キャンパス
• [Remarks] Micheletto Laboratory Home-page
  • URL: http://ruggero.sci.yokohama-cu.ac.jp/