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Illuminating device and surface lighting source device and flat display device with the same

A technology of light-emitting devices and light-emitting elements, which is applied to the components of lighting devices, lighting devices, static indicators, etc., and can solve the problems of further improvement in light extraction efficiency

Inactive Publication Date: 2010-01-27
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] like figure 1 The traditional light-emitting device shown can extract green light more efficiently, but its light extraction efficiency still needs to be further improved

Method used

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  • Illuminating device and surface lighting source device and flat display device with the same
  • Illuminating device and surface lighting source device and flat display device with the same
  • Illuminating device and surface lighting source device and flat display device with the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] The present invention targets for example figure 1 After further investigation of the traditional light-emitting diode structure, it is found that it still has some shortcomings. Since the semiconductor layers 106 , 108 such as GaN generally have a refractive index of about n=2.4, while the encapsulation layer 114 has a refractive index of about n=1.5. Due to the characteristics of optics, the light emitted by the LED element 105 , such as ultraviolet light or blue light, will generate internal total reflection on the interface. In this way, part of the light emitted by the LED element 105 will be reflected back to the LED element 105 and cannot be effectively used, and it may also be converted into heat energy after being absorbed by the material of the LED element 105, reducing the use of the LED element 105 Lifespan and more. In addition, at the interface from the package body 114 to the air, the relatively generated green light also has total internal reflection p...

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PUM

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Abstract

The invention discloses a light emitting apparatus, which comprises at least a light emitting element structure, a lead structure and a space body with volume. The light emitting element structure is arranged inside the space body with volume, electrically coupled with the lead structure and can emit the light in the first frequency range driven by moderate voltage. The light discharge surface of the light emitting element structure is covered with a first reflection layer relative to the light of the first frequency range. The space body with volume is filled with sealing material which at least includes light emitting matter and can produce the light of the second frequency range excited by the light of the first frequency range. A total reflection layer is arranged on the light discharge surface of the light emitting apparatus so as to reflect the light of the first frequency range back to the space body with volume in all direction or most parts totally, and the excited light of the second frequency range can pass the total reflection layer.

Description

technical field [0001] The present invention relates to a light emitting device, and in particular to a light emitting device capable of improving light extraction efficiency, such as a green light emitting device. Background technique [0002] Solid-state organic and inorganic light-emitting components are currently used in a wide range of applications, such as common components for generating light sources. However, the light extraction efficiency of a light-emitting element is one of the important parameters that determine its quality. Taking general inorganic solid-state light sources as an example, GaN-based light-emitting diodes (GaN based LEDs), for example, have light-emitting materials such as AlGaInN or InGaN. As for the emission wavelength range of solid-state inorganic light-emitting diodes, it is generally between 400nm and 600nm. However, its luminous efficiency will decrease sharply in the green light range of light wavelength range from 525nm to 575nm. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/00F21V13/00G09G3/32G09G3/3208H01L33/44
Inventor 王日富祁锦云陈秋伶詹逸民
Owner IND TECH RES INST
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