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Characterization of defect levels in UV-LEDs by below-gap excitation light under operating condition

Research Project

Project/Area Number 18K04954
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 30010:Crystal engineering-related
Research InstitutionSaitama University

Principal Investigator

Kamata Norihiko  埼玉大学, 理工学研究科, 教授 (50211173)

Co-Investigator(Kenkyū-buntansha) 矢口 裕之  埼玉大学, 理工学研究科, 教授 (50239737)
平山 秀樹  国立研究開発法人理化学研究所, 開拓研究本部, 主任研究員 (70270593)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
KeywordsUV-LED / 青~緑色LED / 欠陥準位 / 非発光再結合 / 禁制帯内励起光 / 青色LED / 緑色LED / 紫外LED / 動作時の欠陥検出 / 高効率化
Outline of Final Research Achievements

It is possible to characterize nonradiative recombination (NRR) centers by detecting intensity change of photoluminescence (PL) due to the addition of an intermittent below-gap excitation (BGE) light under constant above-gap excitation (AGE) light. The change of EL intensity and forward current due to the BGE light is used to characterize NRR centers in an LED under forward bias condition in this study. The method is valid for a wide range of carrier injection and connects the result of weak excitation by previous PL study and actual LED performance.

Academic Significance and Societal Importance of the Research Achievements

SDGsに向け現代社会を支える科学技術の高度化が求められている。AlGaNやInGaN-LEDは波長域を拡大しながら広く社会に用いられているが、コストパフォーマンスに優れた基板を欠くために貫通転位や点欠陥が多く、それらが非発光再結合準位としてはたらきLEDの効率低下と寿命の短縮をもたらす。これまで材料研究としてのフォトルミネッセンスの蓄積はあるが弱励起領域に限定されており、LEDの動作領域とは異なっていた。本研究により両者の間を繋げる新たな手法が得られたため、これまでの欠陥準位に関する蓄積を実際の動作領域での欠陥準位のふるまいの理解と、その低減策に役立てることが可能となった。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (26 results)

All 2021 2020 2019 2018

All Journal Article (5 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (19 results) (of which Int'l Joint Research: 12 results,  Invited: 3 results) Book (2 results)

  • [Journal Article] Spectroscopy of Nonradiative Recombination Levels by Two‐Wavelength Excited Photoluminescence2020

    • Author(s)
      Kamata Norihiko
    • Journal Title

      physica status solidi (b)

      Volume: 258 Issue: 2

    • DOI

      10.1002/pssb.202000370

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Superlattice period dependence on nonradiative recombination centers in the n-AlGaN layer of UV-B region revealed by below-gap excitation light2020

    • Author(s)
      M. Ismail Hossain, Yuri Itokazu, Shunsuke Kuwaba, Norihiko Kamata, Noritoshi Maeda, and Hideki Hirayama
    • Journal Title

      AIP Advances

      Volume: 10 Issue: 3

    • DOI

      10.1063/1.5134698

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Temperature dependence of nonradiative recombination processes in UV-B AlGaN quantum well revealed by below-gap excitation light2020

    • Author(s)
      M. Ismail Hossain, Yuri Itokazu, Shunsuke Kuwaba, Norihiko Kamata, and Hideki Hirayama
    • Journal Title

      Optical Materials

      Volume: 105 Pages: 109878-109878

    • DOI

      10.1016/j.optmat.2020.109878

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Nonradiative recombination centers in deep UV-wavelength AlGaN quantum wells detected by below-gap excitation light2019

    • Author(s)
      Hossain M. Ismail、Itokazu Yuri、Kuwaba Shunsuke、Kamata Norihiko、Maeda Noritoshi、Hirayama Hideki
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 58 Issue: SC Pages: SCCB37-SCCB37

    • DOI

      10.7567/1347-4065/ab1069

    • NAID

      210000156272

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Study of Nonradiative Recombination Centers in n-GaN Grown on LT-GaN and AlN Buffer Layer by Below-Gap Excitation2018

    • Author(s)
      M. D. Haque, M. Julkarnain, A. Z. M. Touhidul Islam, N. Kamata and T. Fukuda
    • Journal Title

      Advances in Material Physics and Chemistry

      Volume: 8 Issue: 03 Pages: 143-155

    • DOI

      10.4236/ampc.2018.83010

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] InGaN-LED動作時の禁制帯内励起光照射による非発光再結合準位の検出2021

    • Author(s)
      千代田 夏樹、鎌田 憲彦、矢口 裕之
    • Organizer
      第68回応用物理学会春季学術講演会、19p-Z29-2
    • Related Report
      2020 Annual Research Report
  • [Presentation] 中間バンド型GaPN混晶のキャリア再結合過程の光学的評価:窒素濃度1.4%と3.2%の比較2021

    • Author(s)
      岩井 宏樹、フェルドス サンジーダ、鎌田 憲彦、八木 修平、矢口 裕之
    • Organizer
      第68回応用物理学会春季学術講演会、19p-Z29-1
    • Related Report
      2020 Annual Research Report
  • [Presentation] 電流注入と光励起を用いた UV-LED 内の欠陥準位の検出2020

    • Author(s)
      白井 草汰、千代田 夏樹、鎌田 憲彦、糸数 雄吏、山初 駿太、平山 秀樹
    • Organizer
      第67回応用物理学会春季学術講演会、14p-PB2-6、(2020.3.14)
    • Related Report
      2019 Research-status Report
  • [Presentation] Detection of Nonradiative Recombination Levels in UV-LEDs by Irradiating Below-Gap Excitation Light2019

    • Author(s)
      Norihiko Kamata, Ken Matsuda, Sota Shirai, Zentaro Honda, and Hideki Hirayama
    • Organizer
      Compound Semiconductor Week (CSW) 2019, TuP-D-11 (Poster), Nara, May 21, 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Carrier Recombination Processes in GaAs- and GaN-Based Semiconductors and Optical Characterization of Defect Levels,2019

    • Author(s)
      Norihiko Kamata
    • Organizer
      5th Int. Conf. on Computer, Communication, Chemical, Materials & Electronic Engineering (IC4ME2), Keynote-2 (Invited), Rajshahi (Bangladesh), July 12, 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Nonradiative Recombination Centers in UVB AIGaN Quantum Well and Their Temperature Dependence Revealed by Below-Gap Excitation Light2019

    • Author(s)
      M. Ismail Hossain, Yuri Itokazu, Shunsuke Kuwaba, Norihiko Kamata, Noritoshi Maeda and Hideki Hirayama
    • Organizer
      The 9th Asia-Pacific Workshop on Widegap Semiconductors (APWS2019), MoP-CH-12(Poster), Okinawa, Nov.11, 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 固体の中の光と影 -光の科学と固体光源の可能性を拓く技術-2019

    • Author(s)
      鎌田憲彦
    • Organizer
      2019年度(第52回)照明学会全国大会(招待講演), 九州大学伊都キャンパス, 2019年9月12日
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Nonradiative Recombination Centers in UV-LED Chips Detected by Below-Gap Excitation Light,2019

    • Author(s)
      Ken Matsuda, Sota Shirai, Zentaro Honda, and Norihiko Kamata,
    • Organizer
      2019 Asia-Pacific Conf. on Engineering and Natural Sciences (APICENS)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Milliwatt Power UVA LEDs Developed by Using AlGaN Superlattice (SL) Buffer Layers Fabricated on AlN/Sapphire Templates2018

    • Author(s)
      Muhammad Ajmal Khan, Takuma Matsumoto, Yuri Itokazu, Noritoshi Maeda, Masafumi Jo, Norihiko Kamata, and Hideki Hirayama
    • Organizer
      The 19th Int. Conf. on Metalorganic Vapor Phase Epitaxy ICMOVPE
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 325nm Emission From Highly Transparent AlGaN UVA LEDs Grown on AlN Template in the LP-MOCVD2018

    • Author(s)
      Muhammad Ajmal Khan, Takuma Matsumoto, Yuri Itokazu, Noritoshi Maeda, Masafumi Jo, Norihiko Kamata, and Hideki Hirayama
    • Organizer
      The 19th Int. Conf. on Metalorganic Vapor Phase Epitaxy (ICMOVPE)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Optical Characterization of Defect Levels in AlGaN Multiple Quantum Wells by Using Below-Gap Excitation Light2018

    • Author(s)
      N. Kamata, Y. Itokazu, Md H. Ismail, and H. Hirayama
    • Organizer
      The 2018 Int. Symp. for Advanced Materials Research (ISAMR 2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Improved Arrangement of Deep UV LEDs for Water-Purification System2018

    • Author(s)
      T. Miya, and N. Kamata
    • Organizer
      The 2018 Int. Symp. for Advanced Materials Research (ISAMR 2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Nonradiative Recombination Centers in AlGaN Deep UV-LEDs Detected by Below Gap Excitation Light2018

    • Author(s)
      M. Ismail Hossain, Yuri Itokazu, Shunsuke Kuwaba, Norihiko Kamata, Noritoshi Maeda, and Hideki Hirayama
    • Organizer
      The Int. Workshop on Nitride Semiconductors (IWN2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Nonradiative Recombination Centers in UV-LEDs Detected by Below-Gap Excitention Light Under Current Injection2018

    • Author(s)
      Sota Shirai, Ken Matsuda, Norihiko Kamata, and Zentaro Honda
    • Organizer
      The Int. Workshop on Nitride Semiconductors (IWN2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Efficient carrier injection in UVC AlGaN LEDs with thick p-AlGaN layers2018

    • Author(s)
      Shunsuke Kuwaba, Yuri Itokazu, Masafumi Jo, Norihiko Kamata, and Hideki Hirayama
    • Organizer
      The Int. Workshop on Nitride Semiconductors (IWN2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Influence of the nucleation conditions on the quality of AlN layers with high temperature annealing and regrowth processes2018

    • Author(s)
      Yuri Itokazu, Shunsuke Kuwaba, Masafumi Jo, Norihiko Kamata, and Hideki Hirayama
    • Organizer
      The Int. Workshop on Nitride Semiconductors (IWN2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 半極性AIN/サファイアの結晶成長とUVC-LED実現へのアプローチ2018

    • Author(s)
      定昌史, 糸数雄吏, 桑葉俊輔, 鎌田憲彦, 平山秀樹
    • Organizer
      独立行政法人日本学術振興会 ワイドギャップ半導体光・電子デバイス第162委員会, 第110回研究会・特別公開シンポジウム「紫外発光デバイスの最前線と将来展望」
    • Related Report
      2018 Research-status Report
  • [Presentation] 深紫外AlGaN発光ダイオード特性のp-AlGaN膜厚依存性2018

    • Author(s)
      桑葉 俊輔、糸数 雄吏、定 昌史、鎌田 憲彦、平山 秀樹
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] 高温アニール・再成長により作製したAlNの結晶性に及ぼす核形成条件の影響2018

    • Author(s)
      糸数 雄吏、桑葉 俊輔、定 昌史、鎌田 憲彦、平山 秀樹
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Research-status Report
  • [Book] 新編「照明専門講座テキスト」第35期2019

    • Author(s)
      鎌田憲彦、神野雅文、清水恵一、八田章光、松島公嗣、宇山徹、池田紘一、入倉隆、佐々木淳、別所誠、鵜川浩一、上谷芳昭、田淵義彦、吉澤望、松下美紀、河合悟、稲森真、近藤俊幸、鯨井政祐、土井正、村上克介、木下忍、桑原克佳、長篤志、橋本和明
    • Publisher
      一般社団法人照明学会, 印刷所㈱サンワ
    • Related Report
      2019 Research-status Report
  • [Book] 新編「照明専門講座テキスト」第34期2018

    • Author(s)
      鎌田分担執筆
    • Total Pages
      19
    • Publisher
      一般社団法人照明学会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-03-04  

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