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Blue light perovskite film and blue light perovskite light emitting diode

A light-emitting diode and perovskite technology, applied in semiconductor devices, electrical components, circuits, etc., to achieve high external quantum efficiency, narrow half-peak width, and simple preparation process

Active Publication Date: 2020-04-21
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

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

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Embodiment 1

[0040] This embodiment provides a blue perovskite light-emitting diode, the preparation method of which comprises the following steps:

[0041] Step 1: Carry out pretreatment after standardized cleaning and drying of the ITO transparent conductive glass substrate;

[0042] Step 2: Transfer ITO to the glove box, spin-coat PVK organic solution with a concentration of 6 mg / mL, and a spin-coating speed of 4000 rpm. After 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: According to the general formula (PEABr) m (NPABr 2 ) c (CsBr) n PbBr 2 The ratio, add PEABr, NPABr in the solvent 2 , CsBr and PbBr 2 , configured to obtain a perovskite precursor solution, PbBr in the perovskite precursor solution 2 The molar concentration is 0.08mM / mL, wherein, m=0.8, c=0.4, n=1, and the solvent is DMSO;

[0044]Step 4: spin-coat the precursor solution obtained in step 3 on the surface of t...

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 perovskite light-emitting diodes prepared above are as follows: Figure 4 , the results show that its peak position is 476nm, the half-peak width is 25nm, the spectrum is very stable under different operating 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 502nm.

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Abstract

The invention relates to a preparation method of a blue light perovskite film. The method comprises the following steps: dissolving PEABr, NPABr2, CsBr and PbBr2 into an organic solvent to obtain a perovskite precursor solution, wherein in the perovskite precursor solution, a molar concentration of the PbBr2 is 0.05 to 0.2 mM / mL, and a molar ratio of the PEABr to the NPABr2 to the CsBr to the PbBr2 is 0.4 to 0.9: 0.3 to 0.6: 0.9 to 1.2: 1; and coating a surface of a substrate with the perovskite precursor solution, annealing at 60 to 80 DEG C, and obtaining the blue light perovskite film afterannealing is completed. The invention also discloses a blue light perovskite light emitting diode based on the blue light perovskite film prepared by the method. The blue light perovskite light emitting diode comprises a transparent conductive substrate, a hole transport layer, the blue light perovskite film, an electron transport layer, an electron injection layer and a metal cathode electrode which are arranged in sequence.

Description

technical field [0001] The invention relates to the field of photoelectric 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 ) The material with the same crystal structure was discovered by Gustav Rose in 1839 and was later named by 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 physical and chemical 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, with a wide range, many of which are artificially synthesized. Perovskites (CH) used in sola...

Claims

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Application Information

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