Blue light perovskite light emitting diode and preparation method thereof

A technology of light-emitting diodes and blue light-emitting layers, which is applied in semiconductor/solid-state device manufacturing, electrical components, circuits, etc., can solve the problem of poor conductivity of quasi-two-dimensional perovskites, coexistence of perovskite phases, and fine-tuning quasi-two-dimensional Problems such as difficulty in perovskite phase distribution, to achieve the effect of improving external quantum efficiency and improving luminous efficiency

Active Publication Date: 2020-07-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method of constructing a quasi-two-dimensional structure can avoid spectral changes caused by the migration of mixed halide ions, it is very difficult to fine-tune the phase distribution in the quasi-two-dimensional perovskite, and it is easy to produce the coexistence of different n-value perovskite phases. phenomenon, leading to the transfer of exciton energy from the low-n value perovskite phase to the high-n value perovskite phase, and the conductivity of the quasi-two-dimensional perovskite will deteriorate, so the luminous brightness and not efficient

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  • Blue light perovskite light emitting diode and preparation method thereof
  • Blue light perovskite light emitting diode and preparation method thereof
  • Blue light perovskite light emitting diode and preparation method thereof

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Embodiment 1

[0059] This embodiment provides a blue perovskite light-emitting diode doped with NaBr, which sequentially includes an anode, a hole injection layer, a hole transport layer, a blue light emitting layer, an electron transport layer, an electron injection layer and a cathode from bottom to top , the preparation method is as follows:

[0060] (1) Prepare two kinds of perovskite precursor solutions according to the concentration of each material in Table 1.

[0061] (2) Prepare a 0.4 mol / L ethanol solution of nickel acetate pentahydrate, and add 0.4 mol / L ethanolamine after the dissolution is complete to obtain a mixed solution. The mixed solution was spin-coated on ITO glass at 4000rpm for 30 seconds, and annealed at 350°C for 1 hour to obtain NiO x layer.

[0062] (3) Prepare 8 mg / mL PVK chlorobenzene solution, and add TAPC at 3 mg / mL to obtain PVK:TAPC solution. The PVK:TAPC solution was spin-coated at 4000rpm for 30 seconds on the NiO prepared in step (2). x layer, and ann...

Embodiment 2

[0074] This embodiment provides a blue-light perovskite light-emitting diode doped with NaBr and regulated by Pb composition, which sequentially includes an anode, a hole injection layer, a hole transport layer, a blue light-emitting layer, and an electron transport layer from bottom to top. , electron injection layer and cathode, the preparation method is as follows:

[0075] (1) Prepare two kinds of perovskite precursor solutions according to the concentration of each material in Table 3.

[0076] (2) Prepare a 0.4 mol / L ethanol solution of nickel acetate pentahydrate, and add 0.4 mol / L ethanolamine after the dissolution is complete to obtain a mixed solution. The mixed solution was spin-coated on ITO glass at 4000rpm for 30 seconds, and annealed at 350°C for 1 hour to obtain NiO x layer.

[0077] (3) Prepare 8 mg / mL PVK chlorobenzene solution, and add TAPC at 3 mg / mL to obtain PVK:TAPC solution. The PVK:TAPC solution was spin-coated at 4000rpm for 30 seconds on the NiO p...

Embodiment 3

[0089] This embodiment provides a blue-light perovskite light-emitting diode doped with NaBr and regulated by Pb composition, which sequentially includes an anode, a hole injection layer, a hole transport layer, a blue light-emitting layer, and an electron transport layer from bottom to top. , electron injection layer and cathode, the preparation method is as follows

[0090] (1) Prepare the perovskite precursor solution according to the concentration of each material in Table 5.

[0091] (2) Prepare a 0.4 mol / L ethanol solution of nickel acetate pentahydrate, and add 0.4 mol / L ethanolamine after the dissolution is complete to obtain a mixed solution. The mixed solution was spin-coated on ITO glass at 4000rpm for 30 seconds, and annealed at 350°C for 1 hour to obtain NiO x layer.

[0092] (3) Prepare three different hole transport layers, respectively:

[0093] a) Prepare 8mg / mL PVK chlorobenzene solution and spin coat NiO prepared in step (2) for 30 seconds at 4000rpm x l...

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Abstract

The invention belongs to the technical field of photoelectric devices, and discloses a blue light perovskite light emitting diode and a preparation method thereof. A blue light emitting layer of the blue light perovskite light emitting diode comprises perovskite, doped alkali metal halides and large-group organic halides, and the large-group organic halide is organic amine chloride LCl or organicamine bromide LBr, wherein L is a positive monovalent organic amine ion of which the ion radius is greater than 300 picometers. According to the invention, the phase distribution of the blue light perovskite is regulated and controlled through the combined action of the large-group organic halide and the alkali metal halide, the formation of a two-dimensional perovskite phase with low exciton binding energy is reduced, and the formation of other low-dimensional perovskite phases with high exciton binding energy is improved, so that the exciton energy loss caused by a strong exciton-phonon coupling effect is inhibited, and the light emitting efficiency of the blue-light perovskite light emitting diode is improved.

Description

technical field [0001] The invention belongs to the technical field of photoelectric devices, and in particular relates to a blue-light perovskite light-emitting diode and a preparation method thereof. Background technique [0002] As a new type of semiconductor material, metal halide perovskite has been successfully used in light-emitting diode devices due to its cheap raw materials, good conductivity, high fluorescence quantum efficiency, narrow emission spectrum, and easy color adjustment. Perovskite light-emitting diodes (PeLEDs), like organic light-emitting diodes (OLEDs), are surface light sources, and have great application potential in the fields of display and lighting. Especially in terms of display, PeLEDs not only have the same advantages as OLEDs, such as fast response, good low temperature resistance, thinness, flexibility and bendability, etc., but also can make up for the shortcomings of OLEDs in terms of poor color purity and high cost. [0003] In recent y...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54H01L51/56
CPCH10K50/11H10K2102/00H10K71/00
Inventor马东阁陈江山庞培元杨德志乔现锋
OwnerSOUTH CHINA UNIV OF TECH