Invention Grant
US08049235B2 Nitride semiconductor light emitting element with bragg reflection layers and anti-reflection layers to improve light extraction efficiency 有权
氮化物半导体发光元件具有布拉格反射层和抗反射层,以提高光提取效率

  • Patent Title: Nitride semiconductor light emitting element with bragg reflection layers and anti-reflection layers to improve light extraction efficiency
  • Patent Title (中): 氮化物半导体发光元件具有布拉格反射层和抗反射层,以提高光提取效率
  • Application No.: US12223172
    Application Date: 2007-01-23
  • Publication No.: US08049235B2
    Publication Date: 2011-11-01
  • Inventor: Ken Nakahara
  • Applicant: Ken Nakahara
  • Applicant Address: JP
  • Assignee: Rohm Co., Ltd.
  • Current Assignee: Rohm Co., Ltd.
  • Current Assignee Address: JP
  • Agency: Rabin & Berdo, PC
  • Priority: JP2006-015259 20060124
  • International Application: PCT/JP2007/050968 WO 20070123
  • International Announcement: WO2007/086366 WO 20070802
  • Main IPC: H01L33/10
  • IPC: H01L33/10 H01L27/15
Nitride semiconductor light emitting element with bragg reflection layers and anti-reflection layers to improve light extraction efficiency
Abstract:
Provided is a nitride semiconductor light emitting element that has improved light extraction efficiency and a wide irradiation angle of outgoing light irrespective of the reflectance of a metal used for an electrode. An n side anti-reflection layer 2 and a p side Bragg reflection layer 4 are formed so as to sandwich an MQW active layer 3 that serves as a light emitting region, and the nitride semiconductor light emitting element has a double hetero structure. On top of the n side anti-reflection layer 2, an n electrode 1 is formed. Meanwhile, at the lower side of the p side Bragg reflection layer 4, a p electrode 5, a reflection film 7, and a pad electrode 8 are formed, and the pad electrode is bonded to a support substrate 10 with a conductive bonding layer 9 interposed in between. Both the n side anti-reflection layer 2 and the p side Bragg reflection layer 4 also serve as contact layers. The n side anti-reflection layer 2 is disposed on the light-extracting-direction side while the p side Bragg reflection layer 4 is disposed on the opposite side to the light-extracting-direction side. Consequently, the light extraction efficiency is improved.
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