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White light LED and lighting apparatus

A technology of LED chips and white light, applied in lighting devices, lighting and heating equipment, light sources, etc., can solve the problems of low luminous efficiency, low afterglow brightness of white LEDs, and few luminous colors, and achieve high luminous efficiency and excellent color rendering Sex, good color rendering effect

Inactive Publication Date: 2008-02-06
黎涤萍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the blue LED chip, the luminous efficiency of the violet LED chip or the ultraviolet LED chip is lower, so the luminous efficiency of the white LED obtained by the second method is lower than that of the white LED obtained by the first method.
In addition, the afterglow brightness of the white LED obtained by the above two methods is low, and the luminous color is not many, which need further improvement

Method used

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  • White light LED and lighting apparatus
  • White light LED and lighting apparatus

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0063] Fig. 1 is a cross-sectional view of a white LED 1a according to Embodiment 1 of the present invention.

[0064] White LED 1a consists of lead wires 2 and 3, ultraviolet LED chip 4 with a peak wavelength of 360nm to 400nm, conductive adhesive 5, bonding wire 6, red phosphor 7R, green phosphor 7G, blue phosphor 7B, resin 8a, 8b and resin 9 composition. A recess is provided on the lead wire 2, on which the ultraviolet LED chip 4 is placed. The ultraviolet LED chip 4 is electrically connected to the lead wire 2 through the conductive glue 5 , and is electrically connected to the lead wire 3 through the bonding wire 6 . The resin 8a covers the ultraviolet LED chip 4, and the resin 8b forms a phosphor layer with the red phosphor powder 7R, the green phosphor powder 7G and the blue phosphor powder 7B, covering the resin 8a. The resin 9 covers the upper parts of the leads 2 and 3, the bonding wire 6 and the resin 8b.

[0065] An example of the manufacturing method of white L...

Embodiment approach 2

[0070] Fig. 2 is a cross-sectional view of a white LED 1b according to Embodiment 2 of the present invention.

[0071] The only difference from the white LED 1a of Embodiment 1 is that in the white LED 1b of Embodiment 2, red phosphor 7R, green phosphor 7G, and blue phosphor 7B are replaced by blue-green phosphor 7BG and red phosphor 7R, for example, Sr 4 al 14 o 25 : Eu, Dy and (Ba, Ca, Mg) 10 (PO 4 ) 6 Cl 2 : Eu is a two-component blue-green phosphor 7BG, using Y 2 o 2 S: Eu is red phosphor 7R.

[0072] When LED1b is working, the ultraviolet LED chip 4 emits ultraviolet light, excites blue-green and red phosphors, and emits white light mixed with blue-green light and red light. After LED1b stops working, due to Sr 4 al 14 o 25 :Eu, Dy are light-storing phosphors, so they can continue to emit blue-green light. By regulating Sr 4 al 14 o 25 : Eu, Dy and (Ba, Ca, Mg) 10 (PO 4 ) 6 Cl 2 The weight ratio of :Eu can adjust the brightness of LED1b when working and...

Embodiment approach 3

[0074] Referring to FIG. 2 , white LED 1 c according to Embodiment 3 of the present invention will be described.

[0075] The only difference from the white LED 1b of Embodiment 2 is that in the white LED 1c of Embodiment 3, blue-green phosphor 7BG and red phosphor 7R are replaced by blue phosphor 7B and yellow phosphor 7Y, for example, Sr 10 (PO 4 ) 6 Cl 2 :Eu as blue phosphor, using Ca 2 MgSi 2 o 7 : Eu, Dy and (Sr, Ba) 2 SiO 4 : Eu as a two-component yellow phosphor.

[0076]When the LED1c is working, the ultraviolet LED chip 4 emits ultraviolet light, excites blue and yellow phosphors, and emits white light mixed with blue light and yellow light. After LED1c stops working, due to Ca 2 MgSi 2 o 7 :Eu, Dy are light-storing phosphors, so they can continue to emit yellow light. By regulating Ca 2 MgSi 2 o 7 : Eu, Dy and (Sr, Ba) 2 SiO 4 : The weight ratio of Eu can adjust the brightness of LED1c when it is working and the afterglow brightness and afterglow tim...

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Abstract

The present invention relates to a white light LED which has a high lighting efficiency, a good color displaying capability and has a plurality of afterglow colors or light storing capability. The present invention adopts at least two white light LED which have different peak value wave lengths and launching spectral and adjusts the two weights of the two fluorescences through the white LED to get the white LED lighting device which has a good color displaying capability, a high lighting efficiency, a plurality of afterglow colors and times.

Description

technical field [0001] The present invention relates to a white light LED and its illuminating device, in particular to a white light LED and its illuminating device with high luminous efficiency, good color rendering and light storage. Background technique [0002] Traditionally, fluorescent lamps, metal halide lamps, and incandescent lamps have been used in lighting devices. Although fluorescent lamps and metal halide lamps have high luminous efficiency, they contain harmful substances such as mercury, while incandescent lamps have low luminous efficiency, short life, and significant heat generation. In order to solve the above-mentioned problems existing in conventional lighting devices, white LED lighting is proposed. In recent years, the luminous efficiency of high-brightness blue, purple, and ultraviolet LEDs necessary for white LED lighting has been continuously improved, and white LED lighting is rapidly being put into practical use. White light LED lighting has the...

Claims

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Application Information

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IPC IPC(8): H01L33/00F21S4/00F21K9/00F21Y113/10F21Y115/10H01L33/50
Inventor 邱行中尹绍刚邱励楠尹远成黎涤萍
Owner 黎涤萍
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