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A kind of oled plant growth light source and preparation method thereof

A plant growth and light source technology, which is applied in the field of OLED plant light source and its preparation, can solve the problems of pollution, uneven illumination, and unfavorable energy utilization, etc., and achieve the effect of low calorific value and waste reduction

Active Publication Date: 2022-04-22
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems in the LED light source: first, the light-emitting chip of the LED light source can only emit monochromatic light, so it is necessary to prepare an LED light source that can emit red light and blue light at the same time, but when preparing an LED light source that emits red light and blue light at the same time, it needs to be in the interior. A large amount of phosphor is filled, and the heavy metals in the phosphor will pollute the environment
Second, the existing method of letting red LEDs and blue LEDs emit light at the same time to obtain a spectrum suitable for plant growth cannot control the relative ratio of red and blue light, so it is impossible to adjust the spectrum according to the needs of different plants
Third, the LED light source generates a lot of heat, which is not conducive to the utilization of energy, and the heat generated at the same time will adversely affect the growth of plants
Fourth, the LED light source is a point light source. The light emitted by a large number of point light sources will cause the plants in different positions to absorb light intensities differently, that is, the illumination is not uniform enough.

Method used

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  • A kind of oled plant growth light source and preparation method thereof

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preparation example Construction

[0037] The present invention also provides a method for preparing the OLED plant growth light source described in the above technical solution, comprising the following steps: successively evaporating a hole injection layer, a hole transport layer, a blue light-emitting layer, a spacer layer, a red light-emitting layer, Electron transport layer, electron injection layer and cathode. In the present invention, there is no special limitation on the operation method of the evaporation, and the evaporation method well known to those skilled in the art can be used.

[0038] In the present invention, when the anode is disposed on the substrate, the present invention preferably cleans the substrate before vapor deposition. The present invention has no special limitation on the cleaning method, and a cleaning method well known to those skilled in the art can be used. In the present invention, the cleaning is preferably to sonicate the substrate sequentially in acetone and isopropanol....

Embodiment 1

[0043] (1) Prepare the ITO (indium tin oxide) substrate, put it into acetone and isopropanol in order to ultrasonic for 90 minutes, complete the cleaning of the substrate, and then put it into the evaporation chamber together with various materials that need to be evaporated, Pump the vacuum in the evaporation chamber to 10 -5 Below Pa, start evaporation;

[0044] (2) A 20nm hole injection layer (2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene ), 20nm hole transport layer N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine (abbreviated as NPB); NPB and 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi for short) were doped and vapor-deposited at a volume ratio of 1:1 to obtain a blue light-emitting layer; Then, TPBi with a thickness of 1nm was evaporated on the blue light-emitting layer as a spacer layer; 0.5nm of RD139 was evaporated as a red light-emitting layer; 30nm of TPBi was evaporated on the red light-emitting layer as an electron transport layer...

Embodiment 2

[0046] The difference from Example 1 is that the thickness of the spacer layer is 2nm, and the rest of the steps are the same as in Example 1, and the obtained OLED plant growth light source is named D2.

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Abstract

The invention relates to the technical field of plant growth light sources, and provides an OLED plant growth light source. In the OLED plant growth light source provided by the invention, a spacer layer is arranged between a blue light emitting layer and a red light emitting layer, and the ratio of red and blue light of the OLED plant growth light source is Control by setting the thickness of the spacer layer. The present invention can change the thickness of the spacer layer when preparing the OLED plant growth light source, and then change the ratio of red and blue light of the OLED plant growth light source. In the present invention, as the thickness of the spacer layer increases, the normalized intensity of the blue light band gradually increases, while the intensity of the red light band gradually decreases, that is, by changing the thickness of the spacer layer, it can be applied to the growth of different varieties of plants. light source. The OLED plant growth light source provided by the present invention can be made into a surface light source, so that plants can receive light with uniform intensity; the OLED itself has low heat generation, which can reduce energy waste.

Description

technical field [0001] The invention relates to the technical field of plant growth light sources, in particular to an OLED plant light source and a preparation method thereof. Background technique [0002] The light sources used for plant growth lighting mainly include sunlight, incandescent lamps, fluorescent lamps, and LEDs. 90% of the solar energy that can reach the ground is concentrated between 290-3000nm, and part of the light with a wavelength below 300nm is very easy to cause diseases to crops. In winter, the light time in some places is not enough, and the indoor natural light is not enough to maintain the growth of plants, so it is necessary to set up artificial light to supplement it. [0003] At present, commonly used artificial lighting includes incandescent lamps, fluorescent lamps, mercury lamps and LED lamps. The advantages of incandescent lamps are that the light source is concentrated, compact, low installation price, small size, many types, and many red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/52A01G7/04
CPCA01G7/045H10K30/865H10K50/85
Inventor 陈果李耀召孙阿辉曲明镐魏斌
Owner SHANGHAI UNIV