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

A technology of light-emitting device and light-emitting element, which is applied in the parts of lighting device, lighting device, static indicator, etc., can solve the problem that light extraction efficiency needs to be further improved.

Inactive Publication Date: 2008-04-02
IND TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional light-emitting device shown in Figure 1 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

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Embodiment Construction

[0037] The present invention has further investigated the structure of the traditional light-emitting diode as shown in FIG. 1 and found that it still has some shortcomings. Since the refractive index of the semiconductor layers 106 and 108 such as GaN is generally about n=2.4, the refractive index of the encapsulation layer 114 is generally about n=1.5. Due to optical characteristics, the light emitted by the light-emitting diode element 105, such as ultraviolet light or blue light, will produce internal total reflection on the interface. In this way, part of the light emitted by the light-emitting diode element 105 will be reflected back to the light-emitting diode element 105 and cannot be used effectively, and may be converted into heat energy after being absorbed by the material of the light-emitting diode element 105, reducing the use of the light-emitting diode element 105 Life and so on. In addition, from the interface between the package body 114 and the air, the relative...

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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 that can improve light extraction efficiency, such as a green light-emitting device. Background technique [0002] Solid organic and inorganic light-emitting elements are currently widely used, such as common elements that generate light sources. However, the light extraction efficiency of a light-emitting element is one of the important parameters that determine its quality. Taking a general inorganic solid-state light source as an example, GaN-based light-emitting diodes (GaN based LEDs), such as AlGaInN or InGaN, are luminescent materials. As for solid-state inorganic light-emitting diodes, the light-emitting wavelength range is generally between 400nm and 600nm. However, the luminous efficiency of the green light range from 525nm to 575nm will be sharply reduced. Therefore, the luminous efficiency of traditional inorganic green LEDs without phosphors i...

Claims

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Application Information

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Patent Type & Authority Applications(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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