Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
NITRIDE SEMICONDUCTOR ULTRAVIOLET LIGHT-EMITTING ELEMENT
Document Type and Number:
WIPO Patent Application WO/2019/159265
Kind Code:
A1
Abstract:
[Problem] To improve the wall-plug efficiency in a nitride semiconductor light-emitting element for producing, to the element exterior, ultraviolet rays emitted from an active layer toward an n-type nitride semiconductor layer side. [Solution] An n-type AlGaN-based semiconductor layer 21 constituting a nitride semiconductor ultraviolet light-emitting element 1 has, present therein, a plurality of Ga-rich layers 21b in thin films that are a part of the n-type layer 21 and have a locally high Ga compositional ratio, so as to be spaced apart in the up/down direction, which is a direction orthogonal to an upper surface of the n-type layer 21. A direction of extension of at least some of the plurality of Ga-rich layers 21b on a first plane parallel to the up/down direction is inclined relative to a line of intersection between the upper surface of the n-type layer 21 and the first plane. The plurality of Ga-rich layers 21b are present in the form of streaks on a second plane parallel to the upper surface of the n-type layer 21 within an upper-layer area of a thickness within 100 nm to a lower side from the upper surface of the n-type layer 21. The Ga-rich layers 21b have a greater AlN mole fraction than the AlN mole fraction of a well layer 22b within an active layer 22 constituting the light-emitting element 1.

Inventors:
HIRANO, Akira (1-5-1, Asahigaoka, Hakusan-sh, Ishikawa 04, 〒9240004, JP)
NAGASAWA, Yosuke (1-5-1, Asahigaoka, Hakusan-sh, Ishikawa 04, 〒9240004, JP)
CHICHIBU, Shigefusa (2-1-1 Katahira, Aoba-ku, Sendai-sh, Miyagi 77, 〒9808577, JP)
KOJIMA, Kazunobu (2-1-1 Katahira, Aoba-ku, Sendai-sh, Miyagi 77, 〒9808577, JP)
Application Number:
JP2018/005126
Publication Date:
August 22, 2019
Filing Date:
February 14, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SOKO KAGAKU CO., LTD. (1-5-1, Asahigaoka Hakusan-sh, Ishikawa 04, 〒9240004, JP)
International Classes:
H01L33/32
Foreign References:
JP2017224841A2017-12-21
JP2012089754A2012-05-10
JP2017168640A2017-09-21
US20140103289A12014-04-17
Attorney, Agent or Firm:
MASAKI, Yoshifumi (Hommachi TS Bldg. 703, 4-7-5 Bakuromachi Chuo-ku Osaka-sh, Osaka 59, 〒5410059, JP)
Download PDF: