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White light LED (light emitting diode) with high color rendering index, high light efficiency and low color temperature and preparation method thereof

A high luminous efficiency, high color rendering technology, applied in electrical components, circuits, semiconductor devices, etc., can solve the problems of low luminous flux and luminous efficiency of devices, and it is difficult to achieve low color temperature and high color rendering white LEDs.

Inactive Publication Date: 2011-11-16
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using InGaN-based blue LED chip to excite YAG:Ce3+ yellow phosphor powder, it is difficult to realize white LED with low color temperature below 4000K and high color rendering of Ra>80
In order to change the shortage of monochromatic phosphors, Zheng Daishun and others used blue LED chips to excite yellow and red phosphors to obtain white LEDs. The Tc and Ra were 3200K and 83.2, respectively, but because the emission peak wavelength of blue LEDs is different from that of red phosphors Mismatch of excitation spectrum, resulting in lower luminous flux and luminous efficiency of the device

Method used

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  • White light LED (light emitting diode) with high color rendering index, high light efficiency and low color temperature and preparation method thereof
  • White light LED (light emitting diode) with high color rendering index, high light efficiency and low color temperature and preparation method thereof
  • White light LED (light emitting diode) with high color rendering index, high light efficiency and low color temperature and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1: A high-color-rendering white LED made according to the above steps, using an LED blue chip with an excitation wavelength of 455nm, matching green phosphors with an emission wavelength of 520nm, yellow phosphors with an emission wavelength of 560nm, and an emission wavelength of 560nm It is a 625nm red phosphor, and its production correlated color temperature is 3100K, wherein the weight ratio of yellow phosphor, red phosphor and green phosphor is 4.5%:0.45%:2.5%, and the balance is adhesive. At this time, the color rendering index is 82, and the luminous efficiency is 85lm / W. Its spectrogram see figure 2 .

Embodiment 2

[0024] Example 2: A high color rendering white LED made according to the above steps, using an LED blue chip with an excitation wavelength of 457.5nm, matching green phosphors with an emission wavelength of 525nm, yellow phosphors with an emission wavelength of 555nm and emission Red fluorescent powder with a wavelength of 625nm has a correlated color temperature of 2960K, wherein the weight ratio of yellow fluorescent powder, red fluorescent powder and green fluorescent powder is 4.5%:0.55%:3.5%, and the balance is adhesive. At this time, the color rendering index is 80, and the luminous efficiency is 87lm / W.

Embodiment 3

[0025] Example 3: A high-color-rendering white light LED made according to the above steps, using an LED blue light chip with an excitation wavelength of 455nm, matching green phosphors with an emission wavelength of 520nm, yellow phosphors with an emission wavelength of 560nm, and an emission wavelength of 560nm It is a 640nm red phosphor, and its production correlated color temperature is 2740K, wherein the weight ratio of yellow phosphor, red phosphor and green phosphor is 4.5%:0.5%:3.0%, and the balance is adhesive. At this time, the color rendering index is 84, and the luminous efficiency is 82lm / W.

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Abstract

The invention relates to a white light LED (light emitting diode) with high color rendering index, high light efficiency and low color temperature and a preparation method thereof. The white light LED comprises a support, an LED blue wafer and a fluorescent powder layer, wherein the LED blue wafer is fixed on the support; the fluorescent powder layer is coated on the LED blue wafer; and the fluorescent powder is a mixture of yellow fluorescent powder, red fluorescent powder, green fluorescent powder and an adhesive. The white light LED provided by the invention has the advantages of high color rendering index, high light efficiency and low color temperature.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a white light LED with high color rendering index, high light efficiency and low color temperature and a preparation method thereof. Background technique [0002] With the improvement of light-emitting diode (LED) chip and packaging technology, white LED is gradually favored by people as a general lighting source. It has a series of advantages such as low voltage, low power consumption, high reliability, and long life. It has been widely used in LED street lamps, LED lamps and other fields. It is a new green light source that complies with the national "energy saving and emission reduction" policy. In September 2009, the European Union took the lead in promulgating the policy of prohibiting the sale of incandescent lamps, and various countries have also announced the progress of the ban, making white LEDs a big step forward in general lighting, especially indoor lighting....

Claims

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Application Information

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IPC IPC(8): H01L33/50H01L33/00
Inventor 杨威程治国
Owner IRICO
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