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Gallate red-light fluorescent material and preparation method and white-light LED light-emitting device

A technology for red fluorescent and light-emitting devices, applied in the fields of luminescent materials, chemical instruments and methods, climate sustainability, etc., can solve the problems of low color rendering index, high correlated color temperature, insufficient red light component of WLEDs, etc. Effective and economical, easy to operate, good color temperature uniformity

Active Publication Date: 2022-02-15
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, insufficient red light component in the overall emission leads to low color rendering index (4500K) of WLEDs

Method used

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  • Gallate red-light fluorescent material and preparation method and white-light LED light-emitting device
  • Gallate red-light fluorescent material and preparation method and white-light LED light-emitting device
  • Gallate red-light fluorescent material and preparation method and white-light LED light-emitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The chemical composition formula of the red fluorescent material of this embodiment is Sr 2 sc 0.5 Ga 1.5 o 5 :xEu 2+ , where x=0.02. According to the stoichiometric ratio of each element in the chemical formula, accurately weigh the powder raw material SrCO 3 , Sc 2 o 3 , Ga 2 o 3 , Eu 2 o 3 . And take the mass ratio of relative total raw material 10%H 3 BO 3 , placed in an agate mortar and ground until the raw materials are fully mixed and evenly transferred to an alumina crucible, placed in a high-frequency induction heater with a reducing atmosphere, rapidly sintered at 1450°C for 5 minutes, cooled naturally, taken out, and ground again A single-phase red fluorescent material was obtained.

[0041] Such as figure 1 , the XRD pattern results prove that no impurity phase is generated, indicating that the phase is pure. Red fluorescent materials have high luminous brightness, wide excitation and narrow emission range, such as figure 2 There is a wide ...

Embodiment 2

[0043] According to the preparation example described in Example 1, the reducing atmosphere is CO, and the red fluorescent material can be synthesized by heating to 1200-1500° C. in a rapid heating device for 4-8 minutes.

Embodiment 3

[0045] A white LED light-emitting device: the white LED light-emitting device includes a packaging substrate, an InGaN semiconductor chip, UV quick-drying resin glue, and two phosphors that can effectively absorb the blue light emitted by the LED chip and release green and red light; The fluorescent powder is the fluorescent material synthesized in the above-mentioned embodiment 1, and its chemical composition formula is Sr 2 sc 0.5 Ga 1.5 o 5 :xEu 2+ , where x=0.02. Among them, the luminescence peak wavelength of the InGaN semiconductor core is ~450nm, and the green phosphor is Ba 2 SiO 4 :Eu 2+ . The two fluorescent powders are evenly dispersed in the UV quick-drying resin glue, covered on the chip by coating or dispensing, and the circuit is connected to obtain the white LED lighting device of the present invention.

[0046] The spectrum of LED lighting devices such as Figure 4 As shown, warm white light emission is achieved. Under 20mA current, its color renderi...

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Abstract

The invention discloses a gallate red-light fluorescent material, a preparation method and a white-light LED light-emitting device, belonging to the technical field of light-emitting materials. Its chemical composition formula is Sr 2 sc 0.5 Ga 1.5 o 5 :xEu 2+ 0.02≤x≤0.15. In addition, the preparation method of the red fluorescent material is also disclosed. The novel red fluorescent material of the invention has a single phase, high luminous efficiency and wide excitation spectrum range. The phosphor preparation method is simple, fast, easy to operate and high in synthesis efficiency. The warm white LED produced by combining the red fluorescent material of the present invention with the existing commercial green fluorescent powder has high luminous brightness, good color rendering performance, high energy conversion rate, and good color temperature uniformity, which can meet the needs of the lighting field, and is a kind of Novel red phosphor for white LED.

Description

technical field [0001] The invention belongs to the technical field of inorganic light-emitting materials, and in particular relates to a gallate red-light fluorescent material, a preparation method and a white-light LED light-emitting device. Background technique [0002] Today, great emphasis has been placed on the research and development of highly efficient phosphor-converted light-emitting diodes (pc-LEDs), which are regarded as an indispensable new-generation solid-state lighting source. It can replace traditional lighting because of its well-known advantages, such as good stability, long life, high luminous efficiency, considerable energy saving capacity, and environmental friendliness. [0003] Conventional WLEDs are fabricated from a combination of blue LED chips and yellow YAG:Ce phosphors. However, the insufficient red light component in the overall emission leads to low color rendering index (<80) and high correlated color temperature (>4500K) of WLEDs. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80H01L33/50
CPCC09K11/7786H01L33/504Y02B20/00
Inventor 夏志国杨至雨
Owner JIANGSU BREE OPTRONICS CO LTD
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