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Light-emitting layer materials for electroluminescent devices based on carbon dots

A luminescent layer and luminescent technology, applied in luminescent materials, electrical solid devices, electrical components, etc., can solve the problems of solid-state carbon dot fluorescence quenching, reduce device brightness, etc., and achieve difficult quenching, high brightness, and simple device structure Effect

Active Publication Date: 2021-07-09
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in many cases, solid-state carbon dots suffer from significant fluorescence quenching defects
At present, the light-emitting layer of carbon dot electroluminescent devices is a solid film of carbon dots, which will significantly reduce the brightness of the device due to the quenching of carbon dot light emission.

Method used

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  • Light-emitting layer materials for electroluminescent devices based on carbon dots
  • Light-emitting layer materials for electroluminescent devices based on carbon dots
  • Light-emitting layer materials for electroluminescent devices based on carbon dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 0.3 g of anhydrous citric acid, 1.2 g of hexadecylamine, and 20 mL of octadecene into a 30 mL microwave reaction tube, and stir for 5 min to make them fully mixed.

[0032] The microwave reaction tube was placed in a microwave reactor, heated to 300° C. under microwave irradiation, and reacted for 10 minutes.

[0033] Heating was stopped after the reaction was completed, and the mixed solution was cooled to 55°C.

[0034] Take out the mixed solution, put it into a rotary evaporator, add 20mL of silica gel powder, connect the rotary evaporator to the rotary evaporator, seal it, set the temperature inside the rotary evaporator to 40°C, and evaporate the solvent to obtain a mixture of carbon dots and silica gel powder.

[0035] Measure 400mL of dichloromethane and 10mL of anhydrous methanol into a beaker to prepare an eluent.

[0036] Fill the chromatographic column with the mixture of carbon dots and silica gel powder prepared above, to the 2 / 3 of the chromatographic...

Embodiment 2

[0041] Weigh 4 mg of oil-soluble carbon dots and 4 mg of polyvinyl carbazole, and dissolve each in 1 mL of chlorobenzene to obtain a solution of oil-soluble carbon dots with a concentration of 4 mg / mL and a solution of polyvinyl carbazole of 4 mg / mL, respectively.

[0042] Measure 350mL of oil-soluble carbon dots solution, and fully mix with 650mL polyvinylcarbazole solution to obtain oil-soluble carbon dots / polyvinylcarbazole chlorobenzene mixed solution.

Embodiment 3

[0044] Weigh 10 mg of oil-soluble carbon dots and 10 mg of polyvinyl carbazole, and dissolve each in 1 mL of chlorobenzene to obtain a solution of oil-soluble carbon dots with a concentration of 10 mg / mL and a solution of polyvinyl carbazole of 10 mg / mL, respectively.

[0045] Measure 350mL of oil-soluble carbon dots solution, and fully mix with 650mL polyvinylcarbazole solution to obtain oil-soluble carbon dots / polyvinylcarbazole chlorobenzene mixed solution.

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Abstract

The invention discloses a light-emitting layer material for an electroluminescent device based on carbon dots, which uses oil-soluble carbon dots as the guest material and polyvinylcarbazole as the main material, which are respectively dissolved in the solvent chlorobenzene. The mass ratio of the materials is 1:2.5-3.5 and mixed as the doped light-emitting layer. The light-emitting layer material of the invention can be used to prepare high-brightness carbon dot electroluminescent devices, and can effectively suppress the luminescence quenching of the devices. The invention prepares yellow light, white light and blue light carbon dot electroluminescent diodes respectively by adjusting the device structure.

Description

technical field [0001] The invention relates to a luminescent material, in particular to a luminescent material prepared by utilizing carbon dots and used for a luminescent layer of an electroluminescence device. Background technique [0002] Quantum dots are zero-dimensional semiconductor nanoparticles with quantum trapping effects. Due to their high quantum yield, narrow emission spectrum, high color saturation, stable chemical properties, anti-photobleaching, adjustable emission color, and excellent photoelectric properties , has been widely used in quantum dot light-emitting diodes in recent years, and has broad application prospects in the field of solid-state lighting and display. [0003] However, because quantum dots contain heavy metal elements such as Cd, Pb, and Hg, which are harmful to biology and the environment, their commercial application may be limited in the future. [0004] Carbon dots, as a new type of carbon nanomaterial, have been widely concerned sinc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/65H01L51/00H01L51/50H10K99/00
CPCC09K11/025C09K11/65H10K85/146H10K85/20H10K50/12Y02B20/00
Inventor 杨永珍郑静霞苗艳勤许佳聪刘旭光王华
Owner TAIYUAN UNIV OF TECH
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