CN-122012095-A - Green light fluorescent material excited by ultraviolet light and preparation method and application thereof

Abstract

The invention relates to a green fluorescent material excited by purple light, and a preparation method and application thereof. The green fluorescent material is Ce 3+ doped garnet structure material, the chemical formula is CaLu 2 ZrSc 1‑x Al 3 O 12 :xCe 3+ , wherein x is more than or equal to 0.02 and less than or equal to 0.06, the excitation spectrum range of the green fluorescent material is 300-480nm, and the emission spectrum range of the green fluorescent material is 450-700nm. Compared with the prior art, the ultraviolet light-excited Ce 3+ -doped oxide-based green light-emitting fluorescent material is a brand new and unreported ultraviolet light-excited Ce 3+ -doped oxide-based green light-emitting fluorescent material, can be matched with the existing ultraviolet light chip, can effectively avoid blue light hazard, has the outstanding advantages of stable physical and chemical properties, simplicity and convenience in preparation, low cost and the like, and is suitable for visible light communication of the air, the sky, the ground and the sea environment.

Inventors

• FANG YONGZHENG
• ZHOU QIHAO
• HOU JINGSHAN
• CHANG KE
• DONG LANGPING
• YANG SHUAI
• QIN ZHIYU
• DING WANJIE

Assignees

• 上海应用技术大学

Dates

Publication Date

20260512

Application Date

20260130

Claims (10)

1. 1. A green light fluorescent material excited by ultraviolet light is characterized in that the green light fluorescent material is a Ce 3+ doped garnet structure material, the chemical formula is CaLu 2 ZrSc 1-x Al 3 O 12 :xCe 3+ , and x is more than or equal to 0.02 and less than or equal to 0.06; The excitation spectrum range of the green fluorescent material is 300-480 nm; The emission spectrum of the green fluorescent material is 450-700 nm.
2. 2. The violet light excited green light fluorescent material of claim 1, wherein the green light fluorescent material emits green light having a central wavelength of 494-512 nm under 419 nm violet light excitation.
3. 3. The violet light excited green fluorescent material of claim 1, wherein a fluorescence lifetime of the green fluorescent material is less than 50 ns.
4. 4. A method for preparing the violet-excited green fluorescent material according to any one of claims 1 to 3, comprising the steps of: S1, weighing a calcium source compound, a lutetium source compound, a zirconium source compound, a scandium source compound, an aluminum source compound, a cerium source compound and a fluxing agent according to stoichiometric ratio, and grinding and mixing uniformly; s2, pre-sintering the mixed powder obtained in the step S1 in an air atmosphere, and naturally cooling to obtain a precursor; and S3, uniformly grinding the precursor obtained in the step S2, performing secondary sintering in a reducing atmosphere, and then cooling to room temperature to finally obtain the purple light excited green fluorescent material.
5. 5. The method of preparing a green fluorescent material excited by violet light according to claim 4, wherein in step S1, the calcium source compound is CaCO 3 , the lutetium source compound is Lu 2 O 3 , the zirconium source compound is ZrO 2 , the scandium source compound is Sc 2 O 3 , the aluminum source compound is Al 2 O 3 , and the cerium source compound is CeO 2 ; The fluxing agent is CaF 2 , and the addition amount of the fluxing agent is 2-5% of the total mass of the raw materials.
6. 6. The method of preparing a green fluorescent material excited by violet light according to claim 4, wherein in step S2, the pre-sintering temperature is 500 to 700 ℃; the presintering time is 4-6h.
7. 7. The method for preparing a green fluorescent material excited by violet light according to claim 4, wherein in the step S3, the temperature of the secondary sintering is 1300-1600 ℃; The secondary sintering time is 6-10h; the reducing atmosphere is a mixed gas of H 2 and N 2 , wherein the volume fraction of H 2 is 3-10%.
8. 8. Use of the violet-excited green fluorescent material of any one of claims 1-3 in a visible light communication system, wherein the visible light communication system comprises: The transmitting end adopts an LED light-emitting device packaged by green fluorescent material excited by ultraviolet light as a signal transmitting light source to modulate an electric signal into an optical signal; and the receiving end is configured to receive the optical signal sent by the transmitting end and convert the optical signal into an electric signal.
9. 9. The application of the ultraviolet excited green fluorescent material in a visible light communication system according to claim 8, wherein the chip of the LED light-emitting device is an ultraviolet chip, and the green fluorescent material is coated on the surface of the chip; The LED light-emitting device can realize light signal transmission in land, air and underwater environments.
10. 10. The use of the violet light excited green fluorescent material of claim 8 in a visible light communication system, wherein a-3 dB bandwidth of the visible light communication system is not less than 15 MHz.

Description

Green light fluorescent material excited by ultraviolet light and preparation method and application thereof Technical Field The invention relates to the technical field of fluorescent materials, in particular to a green fluorescent material excited by ultraviolet light and a preparation method and application thereof. Background White light LEDs are widely used as a green and energy-saving illumination source in the fields of living illumination, display backlight, functional illumination and the like. The main stream implementation mode of the white light LED is to excite YAG, ce 3+ yellow fluorescent powder through a blue light chip and mix to generate white light. However, the technology has the remarkable defects that firstly, the strong blue light wave band emitted by the blue light chip possibly causes retina damage and biological rhythm disorder, namely 'blue light hazard', and is particularly focused in a healthy lighting scene, and secondly, the fluorescence lifetime of the YAG: ce 3+ fluorescent powder is long (about 60-100 ns), so that the frequency response bandwidth is limited (about 12.5 MHz), and high-speed signal modulation is difficult to support, so that the application of the YAG: ce 3+ fluorescent powder in optical communication is restricted. Meanwhile, visible Light Communication (VLC) is used as an emerging wireless communication technology, and utilizes the visible light wave band to transmit data, so that the visible light communication technology has the advantages of rich spectrum resources, no electromagnetic radiation, high safety, integration with a lighting system and the like. VLC is particularly suitable for air-sky-land-sea integrated communication scenes, such as air unmanned aerial vehicle relay, land indoor positioning, underwater sensing network and space station communication, wherein optical signals need to be stably transmitted in complex environments such as the atmosphere and water bodies. However, the frequency response bandwidth of the existing YAG:Ce 3+ fluorescent powder is low, and the requirements of VLC on high speed and low delay cannot be met. Therefore, development of a fluorescent powder with ultraviolet excitation (avoiding blue light hazard), short service life and high bandwidth, which has stability and high-efficiency luminescence property, becomes an urgent requirement for realizing safe and healthy illumination and high-speed VLC. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a green fluorescent material excited by ultraviolet light, and a preparation method and application thereof, so as to meet the urgent requirements of the current space-sky-sea environment visible light communication on a high-speed, low-delay and blue-light-hazard-free light source. The aim of the invention can be achieved by the following technical scheme: The invention firstly provides a green fluorescent material excited by ultraviolet light, which is a Ce 3+ doped garnet structure material, and the chemical formula of the green fluorescent material is CaLu 2ZrSc1-xAl3O12:xCe3+, wherein x is more than or equal to 0.02 and less than or equal to 0.06; The excitation spectrum range of the green fluorescent material is 300-480 nm; The emission spectrum of the green fluorescent material is 450-700 nm. Further, the green fluorescent material emits green light with the center wavelength of 494-512 nm under 419 nm purple light excitation, so that the green fluorescent material can be matched with a commercial purple light chip efficiently. Further, the fluorescence lifetime of the green fluorescent material is lower than 50 ns, and is obviously superior to that of the traditional commercial YAG: ce 3+ fluorescent powder (the lifetime is 60-100 ns). The 4f-5d transition characteristic based on Ce 3+ realizes high-speed signal modulation, and meets the requirement of visible light communication on high bandwidth. Further, the frequency response bandwidth of the green fluorescent material is not lower than 15 MHz. Furthermore, the green fluorescent material is an oxide-based powdery material, has the advantages of stable physical and chemical properties and strong environment interference resistance, and can meet the light transmission requirements of various complex scenes such as air, land, underwater, space and the like. The invention also provides a preparation method of the green fluorescent material excited by the purple light, which comprises the following steps: S1, weighing a calcium source compound, a lutetium source compound, a zirconium source compound, a scandium source compound, an aluminum source compound, a cerium source compound and a fluxing agent according to stoichiometric ratio, and grinding and mixing uniformly; s2, pre-sintering the mixed powder obtained in the step S1 in an air atmosphere, and naturally cooling to obtain a precursor; and S3, uniformly grinding the precursor obtained in the step S2, performing s