Light emitting diode capable of emitting white light

A light-emitting diode, white light technology, applied in the field of fluorescence conversion, can solve the problems of high cost, poor performance, low luminous efficiency, etc., and achieve the effects of low cost, low phase forming temperature, and no pollution in cost

Inactive Publication Date: 2013-02-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low luminous efficiency, poor performance and high cost in the existing light-emitting diodes that emit white light prepared from yttrium aluminum garnet materials, the present invention provides a light-emitting diode that emits white light

Method used

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  • Light emitting diode capable of emitting white light
  • Light emitting diode capable of emitting white light
  • Light emitting diode capable of emitting white light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] with the chemical formula as Ca 0.88 Mg 0.1 O:Ce 3+0.01 Li + 0.01 A light-emitting diode emitting white light is prepared from the yellow phosphor powder, wherein, M is Mg, R is Li, a=0.1, x=y=0.01.

[0031] Using high-temperature solid-phase method, according to the chemical formula Ca 0.88 Mg 0.1 O:Ce 3+ 0.01 Li + 0.01 The stoichiometric ratio of each element weighs 4.928g CaO, 0.4gMgO, 0.173g CeO 2 , 0.088g Li 2 CO 3 , fully ground and mixed, placed in a high-purity corundum crucible, in nitrogen-hydrogen mixed gas (N 2 / H 2 ) in a reducing atmosphere, put it into a high-temperature tube furnace, bake at 1300°C for 4 hours, cool, grind, wash, and dry to get the chemical formula Ca 0.88 Mg 0.1 O:Ce 3+ 0.01 Li + 0.01 The yellow light phosphor powder is mixed with epoxy resin at a weight ratio of 10%, coated on the blue light InGaN chip, and after potting and curing, a light emitting diode emitting white light is obtained.

[0032] When the forward d...

Embodiment 2

[0034] with the chemical formula as Ca 0.88 Sr 0.1 O:Ce 3+ 0.01 Li + 0.01 A light-emitting diode emitting white light is prepared from the yellow phosphor powder, wherein, M is Sr, R is Li, a=0.1, x=y=0.01.

[0035] Using high-temperature solid-phase method, according to the chemical formula Ca 0.88 Sr 0.1 O:Ce 3+ 0.01 Li + 0.01 The stoichiometric ratio of each element weighs 4.928g CaO, 1.036g SrO, 0.173g CeO 2 , 0.088g Li 2 CO 3 , fully ground and mixed, placed in a platinum crucible, placed in a muffle furnace under a carbon monoxide (CO) reducing atmosphere, roasted at 1200 ° C for 5 hours, cooled, ground, washed, and dried to obtain the chemical formula Ca 0.88 Sr 0.1 O:Ce 3+ 0.01 Li + 0.01 The yellow light phosphor powder is mixed with the organic silicon material at a weight ratio of 20%, coated on the blue light InGaN chip, and the white light emitting diode is obtained after potting and curing.

[0036] After testing, the color rendering index of th...

Embodiment 3

[0038] with the chemical formula as Ca 0.88 Ba 0.1 O:Ce 3+ 0.01 Li + 0.01 A light-emitting diode emitting white light is prepared from the yellow phosphor powder, wherein, M is Ba, R is Li, a=0.1, x=y=0.01.

[0039] Using high-temperature solid-phase method, according to the chemical formula Ca 0.88 Ba 0.1 O:Ce 3+ 0.01 Li + 0.01 The stoichiometric ratio of each element weighs 4.928g CaO, 1.533g BaO, 0.173g CeO 2 , 0.088g Li 2 CO 3 , fully ground and mixed, placed in a lead crucible, under ammonia gas (NH 3 ) in a reducing atmosphere, put it into a high-temperature tube furnace, bake at 1250°C for 6 hours, cool, grind, wash, and dry to get the chemical formula Ca 0.88 Ba 0.1 O:Ce 3+ 0.01 Li + 0.01 The yellow light phosphor powder is mixed with the organic silicon material at a weight ratio of 30%, coated on the blue light InGaN chip, and the white light emitting diode is obtained after potting and curing.

[0040] After testing, the color rendering index of ...

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Abstract

The invention provides a light emitting diode (LED) capable of emitting white light, relates to the technical field of fluorescence conversion, and solves the problems of low luminous efficiency, poor performance and high cost of an existing LED capable of emitting white light. The LED comprises a blue InGaN chip, yellow light fluorescence powder and packaging materials, wherein the yellow light fluorescence powder and packaging materials are uniformly mixed at the proportion of 0-50 percent by weight, and are coated on the blue InGaN chip to manufacture the LED capable of emitting white light after encapsulating and curing; and the chemical formula of the yellow light fluorescence powder is Ca1-a-x-y MaO : Ce<3+>xR<+>y, wherein a, x and y are molar fraction of elements, and the value range is that the a is smaller than or equal to 0.1 and larger than 0, the x is equal to the y, the x or the y is smaller than or equal to 0.05 and larger than 0, M represents Be<2+>, Mg<2+>, Sr<2+>, Ba<2+>, and Zn<2+> or Cd<2+>, and R represents Li, Na, K, Rb, Cs, and Ag or Cu. The LED provided by the invention has excellent luminescent performance.

Description

technical field [0001] The invention relates to the technical field of fluorescence conversion, in particular to a light-emitting diode emitting white light. Background technique [0002] The white light solid-state lighting source based on light-emitting diodes (LEDs) has many advantages such as non-toxicity, long life (100,000 hours), high efficiency and energy saving, all solid state, low working voltage, good shock resistance and safety, and can be widely used in various In terms of lighting facilities, including indoor lights, traffic lights, street lights, car taillights, direction lights, brake lights, outdoor super-large screens, display screens and advertising boards, etc., it is a new type of green lighting source that is environmentally friendly and energy-saving. It is generally considered as a new light source to replace traditional lighting devices in the 21st century. [0003] At present, white LEDs mainly use phosphor light conversion to achieve white light ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/50C09K11/55
CPCY02B20/181Y02B20/00
Inventor 郝振东张家骅张霞
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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