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Title:
FLUORESCENT ELEMENT
Document Type and Number:
WIPO Patent Application WO/2022/014380
Kind Code:
A1
Abstract:
A fluorescent element comprising: a substrate having a first main surface and a second main surface, which faces the first main surface; and a Group-III-element nitride semiconductor layer disposed over the first main surface of the substrate and emitting fluorescence upon reception of electrons, wherein the fluorescence is outputted through the first main surface and second main surface of the substrate and the fluorescence comprises a main fluorescent component and a deep-level fluorescent component that has a longer wavelength and a longer life than the main fluorescent component. At least one surface selected from among the second main surface and one or more interfaces including the first main surface which are present between the second main surface and the Group-III-element nitride semiconductor layer has a fractal structure. The fractal structure comprises a plurality of first protrusions and a plurality of second protrusions formed on the surface of each first protrusion, and the modal pitch of the second protrusions of the fractal structure is less than the modal pitch of the first protrusions and is up to 3.2 times an optical wavelength to which the peak wavelength of the main fluorescent component has been converted.

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Inventors:
DAI KOTARO (JP)
SHINOTSUKA KEI (JP)
MAEDA JUNYA (JP)
OKAWARA SATORU (JP)
NAKAMURA TOMOHIRO (JP)
KONDO MINORU (JP)
Application Number:
PCT/JP2021/025170
Publication Date:
January 20, 2022
Filing Date:
July 02, 2021
Export Citation:
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Assignee:
HAMAMATSU PHOTONICS KK (JP)
International Classes:
C09K11/62; C09K11/64; C30B25/02; C30B29/38; H01J37/244
Domestic Patent References:
WO2015053363A12015-04-16
Foreign References:
JP2015230195A2015-12-21
US20180120451A12018-05-03
Other References:
KOTARO DAI, KEIICHI KAJITA, LINGFENG SHEN, YASUHITO KAJITA, KEI SHINOTSUKA: "Improvement of light extraction efficiency of InGaN/AlGaN based LEDs with fractal patterned sapphire substrate", PROCEEDINGS OF THE 61ST JSAP SPRING MEETING; MARCH 17-20, 2014, 30 November 2013 (2013-11-30) - 20 March 2014 (2014-03-20), JP, pages 15-080, XP009534145
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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