Light emitting device having fluorescent multilayer

A technology of light-emitting diodes and multi-layer structures, which is applied in the directions of light-emitting materials, electrical components, and electrical solid-state devices, can solve the problems of low light conversion efficiency and affect the light conversion efficiency of LED devices, and achieves the increase of light conversion efficiency and quantity. Effect

Inactive Publication Date: 2004-11-03
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fluorescent materials A, B, and C have low light conversion efficiencies of about 15% or less when emitting red light having a wavelength of about 620 nm
[0010] Such low light conversion efficiencies of fluorescent materials A, B, and C seriously affect the overall light conversion efficiency of LED devices when emitting red light, so that strenuous efforts are currently being made to develop LED devices with higher light conversion efficiencies

Method used

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  • Light emitting device having fluorescent multilayer
  • Light emitting device having fluorescent multilayer
  • Light emitting device having fluorescent multilayer

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Embodiment Construction

[0035] Hereinafter, the present invention will be described more fully with reference to the accompanying drawings that illustrate exemplary embodiments of the invention. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will convey the concept of the invention to those skilled in the art. In the drawings, the thicknesses of layers and regions are exaggerated for clarity. In different drawings, the same reference numerals designate the same elements.

[0036] Figure 5A and 5B They are cross-sectional views of the lamp-type LED device according to the first embodiment of the present invention and the chip-type LED device according to the second embodiment of the present invention, respectively.

[0037] Please refer to Figure 5A, the lamp type LED device 100 includes a mounting guide po...

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Abstract

A light emitting diode (LED) device having a fluorescent multilayer is provided. The LED device includes an LED chip, which emits excitation light, and a fluorescent multilayer, which is comprised of a plurality of fluorescent layers that emit different colors from one another when being excited by excitation light. Light of a longer wavelength is emitted from a portion of the fluorescent multilayer closer to the LED chip, and light of a shorter wavelength is emitted from a portion of the fluorescent multilayer farther away from the LED chip. Accordingly, it is possible to increase the entire light conversion efficiency of the LED device and the amount of light output from the LED device.

Description

technical field [0001] The present invention relates to a light emitting diode device, and more particularly to a light emitting diode device having a fluorescent multilayer structure, which can provide high light conversion efficiency. Background technique [0002] A light emitting diode device emits white light or various colors of visible light by converting ultraviolet (UV) rays or blue light emitted by a light emitting diode (LED) chip into light having a longer wavelength. For example, ultraviolet light emitted from an LED chip in a white light-emitting LED device excites a fluorescent material, and thus, three primary colors (ie, red (R), green (G), blue (B)) are emitted by the excited fluorescent material. Visible light. Depending on the composition of the fluorescent material, the fluorescent material can emit visible light of different colors. The superposition of visible light rays can appear white light to the human eye. [0003] From lamp type to chip type LE...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/50
CPCH01L2224/48091H01L2224/73265H01L33/504H01L2224/48247H01L2924/00014
Inventor 赵济熙丁文婌郑大洙
Owner SAMSUNG ELECTRONICS CO LTD
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