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White light quantum dot electroluminescent device

A technology of electroluminescent devices and quantum dots, which is applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve the problems of low efficiency and complex structure of quantum dot electroluminescent diodes, so as to improve energy utilization efficiency and improve Effects of Brightness and Current Efficiency

Active Publication Date: 2017-08-01
KUNSHAN NEW FLAT PANEL DISPLAY TECH CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: the efficiency of quantum dot electroluminescent diodes in the prior art is not high, and needs to be further improved, and the quantum dot electroluminescent devices of white light are mostly multi-layer structures with complex structures

Method used

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  • White light quantum dot electroluminescent device

Examples

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Embodiment 1

[0075] The light-emitting layer of this embodiment adopts a yellow-emitting CdSe quantum dot material (accounting for 5wt% of the light-emitting layer, and a blue-emitting TADF material (compound ACRXTN) with a wavelength corresponding to the light-emitting spectrum peak of 490 nm that is 580 nm in wavelength corresponding to the light-emitting spectrum peak. (95 wt % of the light-emitting layer) as the light-emitting layer.

[0076] The quantum dot electroluminescence device structure of the present embodiment is as follows:

[0077] ITO / HATCN(10nm) / NPB(40nm) / TCTA(20nm) / ACRXTN:CdSe =95:5 (30nm) / BCP(20nm) / Alq 3 (30nm) / LiF(1nm) / Al(150nm)

[0078] The experimental data of above-mentioned comparative example 1~3 and embodiment 1 are shown in the following table:

[0079]

[0080] combine Figure 4 It can be seen from the above table that the luminescent material of the luminescent layer of Comparative Example 1 is only quantum dot material, which only emits yellow light ...

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Abstract

The invention discloses a white light quantum dot electroluminescent device, which comprises a light emitting layer, and is characterized in that the light emitting layer comprises a quantum dot material and a thermally-activated delayed fluorescence (TADF) material with complementary colors mutually; and after the luminescent spectrum of the thermally-activated delayed fluorescence material and the absorption spectrum of the quantum dot material are subjected to normalization, the difference of wavelengths corresponding to wave crests is within 50 nm. The TADF material in the light emitting layer of the white light quantum dot electroluminescent device can effectively convert triplet excitons to singlet excitons, the singlet excitons are then transmitted to quantum dots through Forster fluorescence resonance energy transfer, the quantum dots are excited to emit light, and the brightness and the current efficiency of the white light quantum dot electroluminescent device are thus improved.

Description

technical field [0001] The invention belongs to the field of quantum dot electroluminescence, and in particular relates to a high-efficiency white light quantum dot electroluminescence device. Background technique [0002] Quantum dot (quantum dot) is a new generation of luminescent material invented based on the quantum size effect, and the luminescence spectrum changes with the size change. Due to the controllable synthetic diameter and the limitation of the rigid structure, the half-width of the luminescent spectrum is narrow and the color purity is high, which is very suitable as a luminescent material with high color purity. [0003] At present, the efficiency of ordinary quantum dot electroluminescent diodes (QD-LED) is low. The reason is that the light emission of quantum dots belongs to fluorescence, and only singlet excitons can be used. The theoretical internal quantum efficiency does not exceed 25%, and there is still 75%. The triplet excitons in the ions cannot ...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54
CPCH10K50/115H10K50/12H10K50/121H10K2101/27
Inventor 闵超李维维赵菲刘嵩
Owner KUNSHAN NEW FLAT PANEL DISPLAY TECH CENT
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