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Near ultraviolet or ultraviolet excited LED light-emitting device

A light-emitting device, near-ultraviolet technology, applied in the direction of light-emitting materials, electrical components, electrical solid devices, etc., can solve the problems of light decay, low color rendering index of packaged products, narrow half-wave width of emission spectrum, etc., and achieve high energy conversion efficiency. , the effect of good color temperature uniformity

Active Publication Date: 2014-05-07
北京宇极芯光光电技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the document "White LED made of near-ultraviolet chip excitation of three primary colors", because of the different phosphor systems used, the half-wave width of the emission spectrum is relatively narrow, resulting in a generally low color rendering index of the packaged product, which can only reach 82.
Another example is CN1434521, its color rendering index can only reach 82-87, and because it uses sulfide phosphor, and sulfide is easy to decompose when heated, which will inevitably lead to light decay

Method used

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  • Near ultraviolet or ultraviolet excited LED light-emitting device
  • Near ultraviolet or ultraviolet excited LED light-emitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] like Figure 5 As shown, the white light emitting device of this embodiment belongs to the SMD package, including the packaging substrate 3, the LED chip 1 and two electrodes 2, and the two electrodes are respectively at both ends of the packaging substrate 3, and are used to lead out the positive and negative electrodes of the LED chip 1. pole.

[0052] First, the chip 1 is fixed on the package substrate 3 , and the two ends of the chip are respectively connected to the two pole pieces at the bottom of the substrate through gold wires so as to conduct with the two electrodes 2 .

[0053] Then, formulate according to a certain ratio (when the particle size of phosphor powder changes, the ratio needs to be adjusted. In fact, the particle size of each batch of phosphor powder is not exactly the same, so when making LEDs, every time you purchase one Batches of phosphors need to be adjusted once. Also, when the color temperature of the packaged white LEDs is different, the...

Embodiment 2

[0063] like Image 6 As shown, the white light emitting device of this embodiment belongs to an integrated package, including a package substrate 1, an LED chip 2, and two electrodes 3. pole.

[0064] First, a number of chips 2 are fixed on the packaging substrate 1, and the two ends of the chips are respectively connected to the two pole pieces at the bottom of the substrate through gold wires in a series-parallel manner, so as to conduct with the two electrodes 3 .

[0065] Next, after damming and baking, a mixed colloid containing red, green and blue phosphors is formulated in a certain proportion, stirred evenly, and vacuum defoamed.

[0066] Further, the mixed colloid is evenly coated on the LED chip, and the coating thickness is set reasonably to ensure good light color uniformity, so that the LED maintains a high light extraction efficiency without light spots.

[0067] The advantage of integrated packaging is that multiple chips can be arranged on a smaller substrate...

Embodiment 3

[0069] Load the optical filter on the chip of Example 1.

[0070] Its mixed spectrum is as Figure 4 shown.

[0071] After the filter is added, the possible leakage of ultraviolet light is eliminated to harm the human body. On the other hand, the eliminated peak of the purple light emitted by the purple light chip makes the spectral shape of the entire white light LED device closer to the solar spectrum.

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Abstract

The invention relates to a near ultraviolet or ultraviolet excited LED light-emitting device which is composed of a packaging substrate, a near ultraviolet or ultraviolet LED chip and mixed fluorescent powder glue which can be used to effectively absorb light emitted by the LED chip and emit red, green and blue light. The light-emitting peak wavelength of the LED chip is in the range from 380nm to 420nm. The red fluorescent powder is the CaAlSi(ON)3: Eu system. The green fluorescent powder is the SiAlON: Eu system. The blue fluorescent powder is the (Sr, Ba)10(PO4)6Cl2: Eu system. Most of the light generated by the near ultraviolet or ultraviolet LED chip is used for exciting the fluorescent powder, so the color purity of the light only depends on the color purity of the fluorescent powder, and a high color rendering index CRI which is greater than 95 can be obtained, wherein color rendering indexes from R1 to R15 are all greater than 90. According to the invention, the made white LED device has advantages of good spectrum continuity, natural light proximity, that is the solar spectrum, good color temperature uniformity and no light spot.

Description

technical field [0001] The invention relates to the technical field of LEDs, in particular to an LED lighting device excited by near ultraviolet or ultraviolet light. Background technique [0002] In today's increasingly tense energy environment, compared with traditional fluorescent lamps and incandescent lamps, white LEDs, as a new type of lighting source, have significant advantages such as energy saving, environmental protection, short response time, and long life. At present, the LED industry is developing rapidly, the luminous efficiency is increasing year by year, and the price is decreasing year by year. White LEDs are gradually replacing fluorescent lamps and incandescent lamps and entering the home lighting market. There are five main methods of making white LEDs. [0003] 1. Use red, green, blue chips or multiple devices to emit light and mix colors into white light, or use blue + yellow dual chips to mix colors to produce white light through the principle of com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L25/075H01L33/62H01L33/50C09K11/73
Inventor 鲁路侯金钗胡专张晓艳王丙杰
Owner 北京宇极芯光光电技术有限公司
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