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Blue perovskite film and blue perovskite light-emitting diode

A light-emitting diode, perovskite technology, applied in semiconductor devices, electrical components, circuits, etc., to achieve the effects of simple preparation process, narrow half-peak width, and stable light color

Active Publication Date: 2022-07-19
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on red and green perovskite light-emitting diodes has made good progress in recent years by adjusting and improving the thin film crystal phase, particle morphology and coverage, but stable and efficient blue perovskite LEDs still remain facing great challenges

Method used

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  • Blue perovskite film and blue perovskite light-emitting diode
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  • Blue perovskite film and blue perovskite light-emitting diode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a blue light perovskite light-emitting diode, and the preparation method thereof includes the following steps:

[0041] Step 1: The ITO transparent conductive glass substrate is cleaned and dried in a standardized manner and then pretreated;

[0042] Step 2: Transfer the ITO to the glove box, spin-coat the PVK organic solution with a concentration of 6 mg / mL and a spin-coating speed of 4000 rpm. After the spin-coating, a hole transport layer is formed on the surface of the ITO transparent conductive glass with a thickness of 40 nm. ;

[0043] Step 3: Press the general formula (PEABr) m (NPABr 2 ) c (CsBr) n PbBr 2 The ratio of PEABr and NPABr is added to the solvent 2 , CsBr and PbBr 2 , configured to obtain a perovskite precursor solution, PbBr in the perovskite precursor solution 2 The molar concentration of is 0.08mM / mL, wherein, m=0.8, c=0.4, n=1, and the solvent is DMSO;

[0044]Step 4: spin coating the precursor solution obtained ...

Embodiment 2

[0048] This embodiment provides a blue light perovskite light-emitting diode, the preparation method of which is the same as that in embodiment 1, the difference is that in step 3, in the perovskite precursor solution, the ratio of each component is adjusted to m= 0.9, c=0.6, n=1.

[0049] The electroluminescence spectra of the above prepared perovskite light-emitting diodes are as follows: Figure 4 , the results show that the peak position is 476nm, the half-peak width is 25nm, the spectrum is very stable under different working voltages, and the CIE coordinates are (0.105, 0.153) ( Figure 5 ).

Embodiment 3

[0051] This embodiment provides a perovskite light-emitting diode, the preparation method of which is the same as that in embodiment 1, the difference is that in step 3, in the perovskite precursor solution, the ratio of each component is adjusted to m=0.8 , c=0, n=1.

[0052] The light emitted by the perovskite light-emitting diode prepared above is green light with a peak position of 502 nm.

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Abstract

The invention relates to a preparation method of a blue light perovskite film, comprising the following steps: mixing PEABr, NPABr 2 , CsBr and PbBr 2 Dissolved in an organic solvent to obtain a perovskite precursor solution, in the perovskite precursor solution, PbBr 2 The molar concentration of 0.05‑0.2mM / mL, PEABr, NPABr 2 , CsBr and PbBr 2 The molar ratio is 0.4‑0.9:0.3‑0.6:0.9‑1.2:1; the perovskite precursor solution is coated on the surface of the substrate, annealed at 60‑80 °C, and a blue light perovskite film is obtained after annealing. The invention also discloses a blue light perovskite light emitting diode based on the blue light perovskite film prepared by the above method, which comprises a transparent conductive substrate, a hole transport layer, a blue light perovskite film, an electron transport layer, Electron injection layer and metal cathode electrode.

Description

technical field [0001] The invention relates to the field of optoelectronic materials and semiconductor devices, in particular to a blue light perovskite film and a blue light perovskite light emitting diode. Background technique [0002] Perovskite materials are a class of materials with calcium titanate (CaTiO) 3 ) material with the same crystal structure, discovered by Gustav Rose in 1839 and later named by the Russian mineralogist L.A.Perovski. The structural formula of perovskite materials is generally ABX 3 , where A and B are two cations and X is an anion. This peculiar crystal structure gives it many unique physicochemical properties, such as light absorption, electrocatalysis, etc., and has many applications in the fields of chemistry and physics. The perovskite family now includes hundreds of substances, ranging from conductors, semiconductors to insulators, in an extremely wide range, many of which are synthetic. Perovskite (CH) used in solar cells 3 NH 3 Pb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/52H01L51/54H01L51/00H01L51/50H10K99/00
CPCH10K71/12H10K85/00H10K50/11H10K50/80
Inventor 廖良生金严王照奎
Owner SUZHOU UNIV
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