A quantum dot-rare earth long afterglow composite luminescent material and its preparation method and application

A technology of long afterglow luminescence and long afterglow materials, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of limiting the degree of freedom of luminescence regulation and the inability to realize narrow-band emission, and achieves simple synthesis methods, easy large-scale preparation, and easy The effect of promotion

Active Publication Date: 2021-12-14
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, due to the energy level structure characteristics of rare earth ions, rare earth long afterglow materials have different afterglow durations and half-peak widths, so it is impossible to achieve narrow-band emission in the entire visible spectrum, which limits the degree of freedom in light emission control.

Method used

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  • A quantum dot-rare earth long afterglow composite luminescent material and its preparation method and application
  • A quantum dot-rare earth long afterglow composite luminescent material and its preparation method and application
  • A quantum dot-rare earth long afterglow composite luminescent material and its preparation method and application

Examples

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Effect test

preparation example 1

[0049] Preparation Example 1 CsPbCl 3 Preparation of perovskite quantum dots

[0050] Weigh 0.5mmol lead acetate and 0.1mmol cesium carbonate, then add 1mL oleic acid, 1mL oleylamine, 1mL tri-n-octylphosphine and 10mL octadecene, heat to 120°C with nitrogen gas and keep it warm for 10 minutes to form a transparent solution A, then Raise the temperature to 180°C; quickly inject 124 μL of hydrochloric acid into solution A, keep warm for 10 seconds, and quickly cool it in an ice bath (cooling rate is about 10-15°C / second) to room temperature; first centrifuge and then use 10mL cyclohexane and 10mL acetone Wash once, and disperse the precipitate in 30 mL cyclohexane to obtain CsPbCl 3 Perovskite quantum dots.

preparation example 2

[0051] Preparation Example 2 CsPbCl 1.5 Br 1.5 Preparation of perovskite quantum dots

[0052] Weigh 0.5mmol lead acetate and 0.05mmol cesium carbonate, then add 0.5mL oleic acid, 0.5mL oleylamine and 6mL octadecene, heat to 120°C with nitrogen gas and keep it warm for 30 minutes to form a transparent solution A, then heat up to 190°C; Quickly inject 62 μL of hydrochloric acid and 87 μL of hydrogen bromide into solution A, keep warm for 5 seconds, and quickly cool to room temperature in an ice-water bath; centrifuge and then wash once with 5 mL of cyclohexane and 5 mL of acetone, and disperse the precipitate in a 30 mL ring In hexane, CsPbCl is obtained 1.5 Br 1.5 Perovskite quantum dots.

preparation example 3

[0053] Preparation Example 3 CsPbBr 3 Preparation of perovskite quantum dots

[0054] Weigh 0.5mmol lead acetate and 0.08mmol cesium carbonate, then add 1.5mL oleic acid, 1.5mL oleylamine and 8mL octadecene, heat to 120°C with nitrogen gas and keep it warm for 30 minutes to form a transparent solution A, then heat up to 170°C; Quickly inject 173 μL of hydrogen bromide into solution A, keep warm for 10 seconds, and quickly cool in an ice bath (cooling rate is about 10-15°C / second) to room temperature; first centrifuge and then wash once with 5mL cyclohexane and 5mL acetone , and the precipitate was dispersed in 30 mL cyclohexane to give C s PbBr 3 Perovskite quantum dots.

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Abstract

A rare earth-quantum dot long-lasting composite luminescent material and its preparation method and application. The composite material is composed of rare earth long afterglow luminescent material and quantum dots. The composite material of the invention is simple to prepare, and only needs to spin-coat the rare earth long-lasting luminescent material and quantum dots to form a film or directly mix them. By adjusting the types and proportions of rare earth long-lasting luminescent materials and quantum dots, the composite material can realize high-efficiency long-lasting luminescence in the full visible spectrum. The composite material of the invention overcomes the defect that the afterglow emission half-peak width of the traditional rare earth long afterglow material is relatively large, and the luminescence band is limited by the material itself, and realizes the continuous adjustment of the visible light band. The invention finely regulates the afterglow spectrum of the material, and the composite material can be applied to the fields of biological monitoring, biological imaging, optical coding, anti-counterfeiting, display and the like.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a quantum dot-rare earth long-lasting composite luminescent material and a preparation method and application thereof. Background technique [0002] Long afterglow luminescent material is a kind of photoluminescent material that stores part of the excited high-energy photon and releases it slowly in the form of light after the excitation light stops to achieve long-term light emission. Long afterglow materials are widely used in security marking, information display, anti-counterfeiting, stress detection, biological imaging and other fields. (References: B.K.Gupta et al., J.Appl.Phys.2015, 117, 243104) [0003] Rare earth long afterglow luminescent material is a new type of environmentally friendly and energy-saving material. It has high luminous brightness, long afterglow time and good chemical stability, and has attracted widespread attention at home ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/64C09K11/66
CPCC09K11/02C09K11/7792C09K11/665
Inventor 陈学元宫仲亮郑伟高宇委娇娇
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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