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Quantum dot fluorescent material, its preparation method and LED fill/flash lamp

A fluorescent material and quantum dot technology, applied in the field of supplementary/flash lamps, can solve the problems of limited utilization of visible light energy, unsuitable for excessive exploitation, poor image color quality, etc., to achieve improved color fidelity, good light stability, and light efficiency strong effect

Active Publication Date: 2012-10-17
GUANGDONG POLY OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cold light combination of blue light and yellow light lacks red light, which makes other objects such as human skin distorted in color rendering under this group of cold light. Although the lack of this item can be slightly compensated by using other rare earth phosphors, the image color of its image still poor quality
In addition, due to the inherent characteristics of "narrow-band absorption and narrow-band excitation" of rare-earth phosphors, LED supplementary / flash lamps made of traditional rare-earth phosphors have limited utilization of visible light energy and insufficient luminous efficiency.
Moreover, rare earth resources are extremely scarce and should not be exploited excessively

Method used

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preparation example Construction

[0065] When the fluorescent material is composed of quantum dots, the preparation method of the quantum dot fluorescent material comprises:

[0066] Step 1, mixing the quantum dots with different emission wavelengths by mechanical stirring or ultrasonic oscillation to obtain fluorescent materials;

[0067] Step 2, mixing the fluorescent material, resin, and filler by mechanical stirring or ultrasonic oscillation to obtain a mixture;

[0068] Step 3: Vacuumize the mixture for 5-180 min under the conditions of 20-30° C. and 0.01-0.3 MPa to obtain a quantum dot fluorescent material.

[0069] Preferably, the mixture is evacuated at 25°C and 0.1 MPa for 10-60 min to obtain the quantum dot fluorescent material.

[0070] When the fluorescent material is composed of a composite of quantum dots and non-quantum dot fluorescent materials, the preparation method of the quantum dot fluorescent material includes:

[0071] Step 1, mixing the quantum dots and non-quantum dot fluorescent mat...

Embodiment 1

[0116] According to the literature, one-step synthesis of quantum dots with chemical composition gradients (Single-step synthesis of quantum dots with chemical composition gradients, Chemistry of Materials, 2008, 20, 531-539.) was used to prepare red quantum dots with an emission wavelength of 610nm. Put 0.4mmol cadmium oxide, 4mmol zinc acetate, 17.6mmol oleic acid and 20ml 1-octadecene into a 100ml flask and mix, heat to 150°C and vacuumize for 20 minutes, then heat the mixed liquid to 310°C under nitrogen atmosphere, Inject 3ml of trioctylphosphine solution dissolved with 1mmol of selenium powder and 2.3mmol of sulfur powder into the mixed liquid in the flask, continue the reaction at 300°C for 90 minutes, add acetone after the system is cooled to room temperature, centrifuge to obtain a precipitate, and then use chloroform Dissolve the precipitate, repeat the precipitation and dissolution three times, and finally obtain the quantum dot solid, or disperse the quantum dot sol...

Embodiment 2

[0118] According to the literature, CdSeZnS high-efficiency light-emitting diodes with chemical composition gradient structure (Highly efficient green-light-emitting diodes based on CdSeZnS quantum dots with a chemical-composition gradient, Advanced Materials, 2009, 21, 1690-1694.) were prepared with an emission wavelength of 524nm green quantum dots. Put 0.1mmol of cadmium oxide, 4mmol of zinc acetate, 5ml of oleic acid, and 15ml of 1-octadecene into a 100ml flask and mix them, heat to 150°C and vacuumize for 30 minutes, then heat the mixed liquid to 300°C under a nitrogen atmosphere. 2ml of trioctylphosphine solution dissolved with 0.2mmol of selenium powder and 3mmol of sulfur powder was injected into the mixed liquid in the flask. After reacting at 300°C for 10 minutes, 0.5ml of 1-octylthiol was added, and the reaction was continued at 300°C for 2 hours. After cooling the system to room temperature, add acetone, centrifuge to obtain a precipitate, then use chloroform to di...

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Abstract

The invention discloses a quantum dot fluorescent material, which is prepared from the following raw materials of: by weight, 0.01-35 parts of a fluorescent material, 60-90 parts of a resin, and 2-35 parts of a filling material, wherein the fluorescent material comprises quantum dots or a compound of quantum dot and non-quantum dot fluorescent materials. Correspondingly, the invention discloses a preparation method of the above quantum dot fluorescent material. In addition, the invention also discloses a LED fill / flash lamp, which is prepared by steps of: coating the quantum dot fluorescent material on the surface of an unpacked LED chip, curing and packaging. According to the invention, the quantum dot fluorescent material and the LED fill / flash lamp prepared by the utilization of the quantum dot fluorescent material have characteristics of high color rendering index, low color temperature and strong luminous efficiency. By the adoption of the material and the lamp, color trueness of images acquired by image acquisition equipment can be substantially raised.

Description

technical field [0001] The invention relates to the technical field of supplementary / flash lamps, in particular to a quantum dot fluorescent material and a preparation method thereof, and an LED supplementary / flash lamp. Background technique [0002] With the improvement of living standards, people's requirements for image quality are getting higher and higher, and ambient light sources often cannot meet the requirements of image acquisition equipment to acquire high-quality images. Therefore, the application of fill light or flash light on image acquisition equipment is necessary. [0003] LED fill / flash has the characteristics of high light efficiency, high energy saving, low-voltage drive, high safety, long life, and fast response, especially in portable electronic products (such as mobile phones, cameras) more and more to replace traditional fill / flash . However, it is less used in high-end image acquisition equipment. One of the main reasons is that traditional white...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L83/04C08L33/04C08L75/04C08L23/08C08L69/00C08K3/36C08K3/26C09K11/02C09K11/88C09K11/56G03B15/05
Inventor 张涛张志坤李阳
Owner GUANGDONG POLY OPTOELECTRONICS
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