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CN-122002971-A - High-color-rendering-index white light device and preparation method and application thereof

CN122002971ACN 122002971 ACN122002971 ACN 122002971ACN-122002971-A

Abstract

The application discloses a high-color-rendering-index white light device, a preparation method and application thereof, which are characterized in that yellow YAG and broadband red and green nitride fluorescent powder are used for improving the color rendering index of an LED, a flexible polymer is used as a packaging material for preparing the high-color-rendering-index white light LED device applied to a lighting source, the red fluorescent powder and the green fluorescent powder are added on the basis of the yellow fluorescent powder to obtain the white light LED device with the color rendering index of 96.9, the mass proportion of 6901A silica gel and 6901B silica gel is regulated while the color rendering index is high, the fluorescent powder is packaged, and the flexible fluorescent powder composite luminous film with the maximum deformation displacement and the optimal breaking stress is obtained for preparing the device. The color rendering index of the device can be effectively improved, and the adopted packaging film can still show excellent mechanical properties when undergoing stretching and cyclic physical deformation. The method has wide application prospect in the fields of high-performance white light LED lighting devices, wearable equipment and flexible display.

Inventors

  • CHEN RAN
  • YOU YI
  • Wan Haolan
  • Dong Sirong
  • ZHANG LEI
  • SUN WENXU
  • YANG HANYUN

Assignees

  • 南通大学

Dates

Publication Date
20260508
Application Date
20251210

Claims (9)

  1. 1. The preparation method of the high-color-rendering-index white light device is characterized by comprising the following specific steps of: S1, preparing yellow-red-green composite fluorescent powder gel: S11, preparing gel without red and green fluorescent powder, namely weighing yellow fluorescent powder of 0.444 g according to a mass ratio, adding the yellow fluorescent powder into 2g of E625A silica gel and 2g of E625B silica gel mixed gel, and uniformly stirring the blend; S12, preparing gels with different proportions of red fluorescent powder, namely weighing yellow fluorescent powder, red fluorescent powder and green fluorescent powder according to the mass ratio, increasing the mass ratio of the red fluorescent powder, adding the red fluorescent powder into mixed silica gel according to the mass ratio E625A silica gel to E625B silica gel=1:1 in a grouping manner, and uniformly stirring the blend; S13, preparing gels with different proportions of green fluorescent powder, namely weighing yellow fluorescent powder, red fluorescent powder and green fluorescent powder according to the mass ratio, increasing the mass ratio of the green fluorescent powder, adding the materials into mixed silica gel according to the mass ratio E625A silica gel to E625B silica gel=1:1 in a grouping manner, and uniformly stirring the blend; S2, testing the photochromic performance, namely uniformly smearing the prepared yellow, red and green composite fluorescent powder gel on a blue light LED chip, heating the blue light LED chip on a 225 ℃ heating table for 30S, placing the gel into an integrating sphere after the gel is solidified, controlling the color temperature to 5100-5300K by using a spectral radiometer, observing the spectral distribution and the color rendering index, and obtaining yellow, red and green fluorescent powder films with optimal mass ratio for preparing a white light LED device with high color rendering index; S3, preparing a silica gel film, namely adding 6901A silica gel and 6901B silica gel into a centrifuge tube according to the mass ratio of 6901A silica gel to 6901B silica gel = 10:0.5-5, stirring and mixing uniformly, oscillating 15 min in an ultrasonic dispersion instrument to remove bubbles to prepare mixed gel, pouring 5-8 mL mixed gel into a glass culture dish, controlling the film thickness to be 0.5-1.5 mm, standing for 1 hour under normal temperature environment to form a film, taking down the film to test and characterize, and preparing the 6901A silica gel and 6901B silica gel film with optimal mechanical properties and optimal mass ratio for a high color rendering index white light LED device; S4, preparing a flexible fluorescent powder composite luminescent film, namely respectively weighing 6901A silica gel and 6901B silica gel with optimal mass ratio, mixing, adding yellow, red and green fluorescent powder with optimal mass ratio, uniformly stirring, oscillating 15 min in an ultrasonic dispersion instrument to remove bubbles to obtain mixed fluorescent powder gel, pouring 5-8 mL mixed fluorescent powder gel into a glass culture dish, controlling the film thickness to be 0.5-1.5 mm, standing for 1h to form a film in a normal temperature environment, obtaining the fluorescent powder film with optimal mass ratio, and taking down the film for testing and characterization; S5, measuring the mechanical properties of the film, namely respectively testing the mechanical properties of the prepared silica gel film and the prepared fluorescent powder film by using a tensile machine; s6, preparing a white light LED device, namely attaching the prepared fluorescent powder film with the optimal proportion on a blue light LED chip to obtain the white light LED device with high color rendering index, and placing the white light LED device into an integrating sphere to observe spectral distribution and color rendering index by using a spectral radiometer.
  2. 2. The method for preparing the high-color-rendering-index white light device according to claim 1, wherein the yellow fluorescent powder is yellow rare earth yttrium aluminum garnet fluorescent powder YAG, and particularly is Y 3 Al 5 O 12 :Ce 3+ .
  3. 3. The method for manufacturing a high color rendering index white light device according to claim 1, wherein the red fluorescent powder is one or more of AlSiN 3 :Eu 2+ 、SrSiN 3 :Eu 2+ 、CaSiN 3 :Eu 2+ and the green fluorescent powder is BaSi 2 O 2 N 2 :Eu 2+ .
  4. 4. The method according to claim 1, wherein the first group of yellow phosphor 0.234 g, red phosphor 0.047g, green phosphor 0.164 g, E625A silica gel 2g and E625B silica gel 2g, the second group of yellow phosphor 0.22 g, red phosphor 0.067g, green phosphor 0.156g, E625A silica gel 2g and E625B silica gel 2g, the third group of yellow phosphor 0.212g, red phosphor 0.085g, green phosphor 0.148g, E625A silica gel 2g and E625B silica gel 2g, the fourth group of yellow phosphor 0.202g, red phosphor 0.101g, green phosphor 0.141g, E625A silica gel 2g and E625B silica gel 2g, and the fifth group of yellow phosphor 0.193g, red phosphor 0.116g, green phosphor 0.085g, E625A silica gel 2g and E625B silica gel 2 3425.
  5. 5. The method according to claim 1, wherein the first group of yellow phosphor 0.278 g, red phosphor 0.139g, green phosphor 0.0278 g, E625A silica gel 2g and E625B silica gel 2g, the second group of yellow phosphor 0.247 g, red phosphor 0.123g, green phosphor 0.074g, E625A silica gel 2g and E625B silica gel 2g, the third group of yellow phosphor 0.222g, red phosphor 0.111g, green phosphor 0.156g, E625A silica gel 2g and E625B silica gel 2g, the fourth group of yellow phosphor 0.202g, red phosphor 0.101g, green phosphor 0.141g, E625A silica gel 2g and E625B silica gel 2g, and the fifth group of yellow phosphor 0.185g, red phosphor 0.093g, green phosphor 0.0935 g, E625A silica gel 2 and E625B silica gel 2 345 g.
  6. 6. The method for manufacturing a high color rendering index white light device according to claim 1, wherein a spectral radiometer is used in the step S2, the color temperature is controlled to be 5200K, and the spectral distribution and the color rendering index are observed.
  7. 7. The method for manufacturing a white light device with high color rendering index according to claim 1, wherein the oscillation frequency of the ultrasonic disperser in S3 and S4 is 40 kHz.
  8. 8. A high color rendering index white light device prepared by the preparation method of any one of claims 1 to 7 is characterized in that the proportion of yellow, red and green fluorescent powder in a flexible polymer is regulated and controlled, and a blue LED chip is adopted to excite the yellow fluorescent powder, the red fluorescent powder and the green fluorescent powder, so that white light emitted by the LED device is more close to the full spectrum range of natural light, and the high color rendering index white light device is finally prepared.
  9. 9. Use of the high color rendering white light device made by the method of any one of claims 1-7 in high performance white LED lighting devices, wearable devices and flexible display technologies.

Description

High-color-rendering-index white light device and preparation method and application thereof Technical Field The invention belongs to the technical field of white light LED devices, and particularly relates to a high-color-rendering-index white light device, and a preparation method and application thereof. Background White light emitting diode LED gradually replaces traditional illumination light source due to its energy saving, environment protection, high efficiency, long service life and other remarkable characteristics, and is known as next generation mainstream illumination light source. The performance of white LEDs is closely related to the phosphors used. The method for realizing the white light LED is most commonly used based on a blue light chip combined with yellow fluorescent powder. However, the white light obtained suffers from the disadvantages of low color rendering, excessive correlated color temperature, low spectral continuity, and the like due to the absence of a red component in the emission spectrum. Meanwhile, between 480-520 nm of the blue light emitted by the blue light chip and the yellow light spectrum of the YAG fluorescent powder, a green area spectrum is lost, namely a so-called cyan gap. The presence of a cyan gap in the spectrum causes discontinuities in the visible band emission spectrum and also reduces the color rendering index of the white light device. Therefore, the patent compensates the defects by adding the broadband red and green fluorescent powder, and fully improves the color development performance of the device. In addition, silica gel is widely used as an inorganic polymer material, and is widely used in various fields of application due to its excellent physical properties and chemical stability. The LED can resist high temperature and low temperature, effectively solves the problem of shortened service life of the white light LED in use, and avoids fracture or deformation. In addition, the excellent insulating property and good chemical stability of the silica gel make the silica gel become a preferable material in the electronic industry, and also provide a solid foundation for corrosion resistance and long service life of products. If the fluorescent powder and the silica gel are mixed, the flexible luminous layer film applied to the white light device can be prepared, so that the advantages of the LED in the field of illumination are reserved, the excellent mechanical property characteristics of the flexible silica gel material are fully exerted, and the comprehensive advantages of the flexible silica gel material applied to the flexible luminous device are expected to be highlighted. However, the mechanical property characteristics and the optimal proportion of the flexible fluorescent powder luminescent film are verified by a system experiment. Therefore, the development of the white light device with high color rendering index based on the flexible luminous film is important, and the white light device has wide application prospect. Disclosure of Invention The invention aims to solve the core technical problems of low color rendering, over-high correlated color temperature, low spectral continuity and the like of white light in the prior art. The application aims to provide a high-color-rendering-index white light device, a preparation method and application thereof, wherein yellow YAG fluorescent powder and broadband red and green nitride fluorescent powder are used as luminescent materials, and flexible polymers are used as packaging materials innovatively. In order to achieve the above purpose, the present application is realized by the following technical scheme: a preparation method of a high-color-rendering-index white light device comprises the following specific steps: S1, preparing yellow-red-green composite fluorescent powder gel: S11, preparing gel without red and green fluorescent powder, namely weighing yellow fluorescent powder of 0.444 g according to a mass ratio, adding the yellow fluorescent powder into 2g of E625A silica gel and 2g of E625B silica gel mixed gel, and uniformly stirring the blend; S12, preparing gels with different proportions of red fluorescent powder, namely weighing yellow fluorescent powder, red fluorescent powder and green fluorescent powder according to the mass ratio, increasing the mass ratio of the red fluorescent powder, adding the red fluorescent powder into mixed silica gel according to the mass ratio E625A silica gel to E625B silica gel=1:1 in a grouping manner, and uniformly stirring the blend; S13, preparing gels with different proportions of green fluorescent powder, namely weighing yellow fluorescent powder, red fluorescent powder and green fluorescent powder according to the mass ratio, increasing the mass ratio of the green fluorescent powder, adding the materials into mixed silica gel according to the mass ratio E625A silica gel to E625B silica gel=1:1 in a grouping manner, and uniformly stirring the