Perovskite quantum dot ink and luminescent film

A quantum dot and perovskite technology, which is applied in the field of perovskite quantum dot ink and luminescent film, can solve the problems of uneven film formation, poor dispersion stability, easy precipitation, etc. Smooth process effect

Active Publication Date: 2019-04-19
SUZHOU XINGSHUO NANOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing perovskite quantum dot inks can only dissolve low-concentration perovskite quantum dots, and the dispersion stability of perovskite quantum dots in the ink is poor, and they are prone to agglomeration, especially in the inkjet printing process. Inhomogeneous film formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Perovskite quantum dot ink including 16wt% CsPbBr 3 Quantum dots, 80wt% mixed solvent of 1-methylundecane (boiling point: 195°C) and dipentylbenzene (boiling point: 265°C), 4wt% cetyltrimethylammonium bromide. Wherein, the volume ratio of 1-methylundecane to dipentylbenzene is 3:1.

[0039] The above-mentioned perovskite quantum dot ink is placed for inkjet printing, which can be printed continuously for more than 1 hour, and the process is smooth, and finally a flat and uniform luminescent film is obtained. The luminescent performance of the luminescent film was tested, and the initial luminance of the blue backlight used was 1000cd / m 2 , the results of light conversion efficiency, luminance, and external quantum yield (EQE) of the luminescent film are shown in Table 1.

Embodiment 2

[0041] Perovskite quantum dot ink including 12 wt% CH 3 NH 3 PbBr 3 Quantum dots, 86wt% mixed solvent of 1-methylundecane (boiling point: 195°C) and cyclohexylbenzene (boiling point: 240°C), 2wt% cetyltrimethylammonium bromide. Wherein, the volume ratio of 1-methylundecane to cyclohexylbenzene is 4:1.

[0042] The above-mentioned perovskite quantum dot ink is placed for inkjet printing, which can be printed continuously for more than 1 hour, and the process is smooth, and finally a flat and uniform luminescent film is obtained. The luminescent performance of the luminescent film was tested, and the initial luminance of the blue backlight used was 1000cd / m 2 , the results of light conversion efficiency, luminance, and external quantum yield (EQE) of the luminescent film are shown in Table 1.

Embodiment 3

[0044] Perovskite quantum dot ink including 13.5 wt% CH 3 NH 3 PB 3 Quantum dots, 84wt% n-dodecane (boiling point: 216°C) and cyclohexylbenzene (boiling point: 240°C) mixed solvent, 2.5wt% dodecyl dimethyl benzyl ammonium chloride. Wherein, the volume ratio of 1-methylundecane to cyclohexylbenzene is 5:1.

[0045] The above-mentioned perovskite quantum dot ink is placed for inkjet printing, which can be printed continuously for more than 1 hour, and the process is smooth, and finally a flat and uniform luminescent film is obtained. The luminescent performance of the luminescent film was tested, and the initial luminance of the blue backlight used was 1000cd / m 2 , the results of light conversion efficiency, luminance, and external quantum yield (EQE) of the luminescent film are shown in Table 1.

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Abstract

The present application discloses a perovskite quantum dot ink. The perovskite quantum dot ink comprises 0.1-20 wt% of perovskite quantum dots, 70-90 wt% of a solvent and 0-5-10 wt% of a cationic dispersant. The addition of the cationic dispersant increases the dispersion concentration and dispersion stability of the perovskite quantum dots in the ink. The perovskite quantum dot ink achieves a smooth process when applied to inkjet printing, and makes an obtained luminescent film have excellent properties.

Description

technical field [0001] The application belongs to the field of display technology, and in particular relates to a perovskite quantum dot ink and a luminescent film. Background technique [0002] Quantum dots, also known as semiconductor nanocrystals, have been widely used in optoelectronic fields such as biomedicine, LEDs, photodetectors, and solar cells due to their excellent optical properties such as excitation line width, narrow emission, and high fluorescence efficiency. The luminescence of traditional II-VI quantum dots strongly depends on its quantum confinement effect, and the luminescence position will change with the size of the quantum dots, which usually results in broadening of the emission spectrum, low synthesis repeatability, and the luminescence position is susceptible to temperature effect. In comparison, the quantum confinement effect of perovskite quantum dots (PQDs) is relatively weak, and the size inhomogeneity and surface trap state will not have a gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/38
CPCC09D11/38
Inventor 方龙邓德晖王允军刘志军史横舟
Owner SUZHOU XINGSHUO NANOTECH CO LTD
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