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Light emitting device, and back light and liquid crystal display employing it

一种发光装置、发光色的技术，应用在发光材料、气体放电灯的使用、光学等方向，能够解决品质和特性降低等问题

Active Publication Date: 2007-08-22
SEOUL SEMICONDUCTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon (inhomogeneity of light) is not ideal when using LED lamps in lighting equipment, etc., and is the main cause of deterioration in quality and characteristics.

Method used

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  • Light emitting device, and back light and liquid crystal display employing it
  • Light emitting device, and back light and liquid crystal display employing it
  • Light emitting device, and back light and liquid crystal display employing it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] First, each phosphor is prepared: Europium-activated alkaline earth chlorophosphate ((Sr, Ca, Ba, Eu) 10 (PO 4 ) 6 · Cl 2 ) phosphor, europium and manganese activated alkaline earth aluminate (3(Ba, Mg, Eu, Mn)O·8Al 2 o 3 ) phosphor, europium and cerium activated acid lanthanum sulfide ((La, Eu, Sm) 2 o 2 S) Phosphor. Here, a blue light-emitting phosphor with an average particle diameter of 6.0 μm, a green light-emitting phosphor with an average particle diameter of 7.0 μm, and a red light-emitting phosphor with an average particle diameter of 9.5 μm were used. The average particle diameter of a mixture of these phosphors was 8.8 μm.

Embodiment 2

[0061] In the above-mentioned Example 1, except that the blue light-emitting phosphor with an average particle size of 12.0 μm, the green light-emitting phosphor with an average particle size of 13.0 μm, and the red light-emitting phosphor with an average particle size of 10.5 μm were used, the same method as in Example 1 was used. , made into an integrated three-color mixed phosphor (BGR phosphor). Furthermore, an LED lamp was produced in the same manner as in Example 1 using this integrated phosphor. This LED lamp was subjected to the characteristic evaluation mentioned later.

Embodiment 3

[0063] In the above-mentioned Example 1, except that the addition amount of barium borate and calcium in the integration process was 0.2% by mass relative to the total amount of each phosphor, it was the same as that of Example 1, and the integrated three-phase phosphor was produced. Color mixing phosphor (BGR phosphor). Furthermore, an LED lamp was produced in the same manner as in Example 1 using this integrated phosphor. This LED lamp was subjected to the characteristic evaluation mentioned later.

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Abstract

A light emitting device 1 has, as a light source, a light emitting semiconductor element such as a light emitting diode 2. Light radiated from the light emitting diode 2 is converted to visible light in a light emitting part 8 having a plurality of phosphors 9 different in emission color, and the visible light is emitted. In such a light emitting device 1, a maximum value (deltax, deltay) of color difference (absolute value) between emission chromaticity (x, y) and emission chromaticity (x1, y1) satisfies conditions of deltax < 0.05 and deltay < 0.05, where (x, y) is emission chromaticity measured directly above the light source and (x1, y1) is emission chromaticity measured for each of front lights and side leakage lights in all directions from the light emitting device 1.

Description

technical field [0001] The present invention relates to a light-emitting device having a light-emitting semiconductor element such as a light-emitting diode as a light source, and a backlight and a liquid crystal display device using the light-emitting device. Background technique [0002] A light emitting diode (LED) is a semiconductor element that converts electric energy into light such as ultraviolet light or visible light and radiates it. For example, LED lamps in which such LED chips are sealed with transparent resin are used in various fields. In order to realize a visible-light LED lamp, an LED chip having a light-emitting layer made of GaP, GaAsP, GaAlAs, GaN, InGaAlP, or the like is used. In addition, studies have been conducted to use light-emitting semiconductor elements such as laser diodes instead of light-emitting diodes as light sources. [0003] Since light-emitting diodes and laser diodes are semiconductor elements, they have a long life and high reliabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/00C09K11/08H01L33/50H01L33/60
CPCH01L33/504C09K11/7734C09K11/7739C09K11/7789G02B6/0023G02B6/0073H01L33/60Y02B20/181H01L2224/48091H01L2224/73265H01L2224/8592Y02B20/00C09K11/77342H01L2924/00014
Inventor 石井努白川康博
Owner SEOUL SEMICONDUCTOR