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Light emitting device

A light-emitting device and light-emitting layer technology, which is applied in the direction of electrical components, electric solid-state devices, circuits, etc., can solve the problems of reducing the amount of light emitted by the light-emitting device, and achieve the effects of light loss suppression and high emission efficiency

Inactive Publication Date: 2004-03-24
TOYODA GOSEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the amount of light emitted (brightness) of the light-emitting device is reduced as a whole

Method used

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Embodiment Construction

[0014] The light-emitting element of the present invention has a light-emitting layer comprising a Group III nitride semiconductor capable of emitting light having a luminescence peak wavelength in the ultraviolet region and light having a luminescence peak wavelength in the visible region. That is, as for the emission wavelength, the light-emitting layer used in the light-emitting element has at least one emission peak in the ultraviolet region and at least one emission peak in the visible region, respectively. As long as the light-emitting layer satisfies this condition, for example, a light-emitting layer having two or more luminescence peaks in the ultraviolet region can be used, and a light-emitting layer having two or more luminescence peaks in the visible region can be used.

[0015] Light in the ultraviolet region must be able to excite the fluorescent material described below, and this light preferably has a wavelength that can excite the fluorescent material with high...

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Abstract

According to the invention, a Group III nitride compound semiconductor light-emitting element is provided with a light-emitting layer comprising two layers of different in ratio of AlGaInN composition, and emitting light with an emission peak wavelength in an ultraviolet region and light with an emission peak wavelength in a visible region. The light-emitting element and a fluorescent material excited by light in the ultraviolet region are combined to configure a light emitting device.

Description

technical field [0001] The present invention relates to a light-emitting device, specifically, the present invention relates to a light-emitting device made by combining a group III nitride semiconductor light-emitting element with a fluorescent material, and can convert a part of the light emitted by the light-emitting element through the fluorescent material Emitting light emitting device. Background of the invention [0002] In the proposed light-emitting device, fluorescent materials are used to change the wavelength of part of the light emitted by the light-emitting element, and the wavelength-converted light is mixed with the light emitted by the light-emitting element, so that it can emit light with a color different from the light color of the light-emitting element itself. For example, a light-emitting device is constructed by combining a blue fluorescent light-emitting element with a fluorescent material excited by blue light to emit light with a wavelength longer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/15H01L33/10H01L33/32H01L33/50H01L33/52H01L33/62
CPCH01L33/32H01L33/08H01L2224/49107H01L2924/01079H01L33/50H01L2924/01025H01L2224/73265H01L2924/12041
Inventor 小泽隆弘柴田直树
Owner TOYODA GOSEI CO LTD