White light organic electroluminescent device

An electroluminescence device and luminescence technology, which is applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve the problems of high cost of phosphorescence, large band gap, and immature performance of the blue light system.

Active Publication Date: 2016-12-07
BEIJING VISIONOX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The article reports that the structure does not fully utilize the energy of direct recombination in the host
At the same time, common host materials are used, the band gap is large, and the required driving voltage is high
[0006] The important scientific problems facing white OLEDs are high efficiency and long life. As mentioned above, using phosphorescent dyes is a feasible method, but phosphorescence faces the problems of high cost and immature performance of blue light systems.

Method used

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  • White light organic electroluminescent device

Examples

Experimental program
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Effect test

Embodiment 1

[0357] White light device using TADF as the main body of the light-emitting layer

[0358] The structure of the OLED device of this embodiment is similar to that of Comparative Example 1, including: an anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode which are sequentially stacked and deposited on a substrate.

[0359] The light-emitting layer of this embodiment adopts a combination of blue fluorescent and yellow fluorescent layers to obtain a white light device. Among them, ITO (Indium Tin Oxide) is used as the anode; MATADA: F 4 TCNQ is used as the hole injection layer; NPB is used as the hole transport layer. Host (1-15) is doped with Rubrene as the yellow light-emitting layer, and Host (1-15) is a thermally activated delayed fluorescent material as the host material of the yellow light-emitting layer. ADN:TBPe was selected for the blue light-emitting layer, and Bphen was prepa...

Embodiment 2

[0362] White light device using TADF as the main body of the light-emitting layer

[0363] The structure of the OLED device of this embodiment is similar to that of Comparative Example 1, including: an anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode which are sequentially stacked and deposited on a substrate.

[0364] The light-emitting layer of this embodiment uses a combination of blue fluorescent and yellow fluorescent layers to obtain a white light device. Among them, ITO (Indium Tin Oxide) is used as the anode; MATADA: F 4 TCNQ is used as the hole injection layer; NPB is used as the hole transport layer. Host (2-8) is doped with Rubrene as the yellow light-emitting layer, and Host (2-8) is a thermally activated delayed fluorescent material that serves as the main body of the yellow light-emitting layer. ADN:TBPe was selected for the blue light-emitting layer, and Bphen was p...

Embodiment 3

[0367] White light device using TADF as the main body of the light-emitting layer

[0368] The structure of the OLED device of this embodiment is similar to that of Comparative Example 1, including: an anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and a cathode deposited on a substrate (not shown in the figure).

[0369] The light-emitting layer of this embodiment adopts a combination of blue fluorescent and yellow fluorescent layers to obtain a white light device. Among them, ITO (Indium Tin Oxide) is used as the anode; MATADA: F 4 TCNQ is used as the hole injection layer; NPB is used as the hole transport layer. Host (1-15) doped Rubrene as the yellow light-emitting layer. Host (2-17): TBPe is selected for the blue light-emitting layer, and Bphen is prepared as the electron transport layer. Finally, LiF is vapor deposited as an electron injection layer, and Al is used as a metal cathode. The device structure is as f...

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Abstract

The invention discloses a white light organic electroluminescent device, which comprises a light emitting layer. Multiple layers of single-color light emitting layers with complementary colors are stacked and combined to form the light emitting layer, the main material of at least one single-color light emitting layer is a thermal active delay fluorescent material, and the main material of each single-color light emitting layer is doped with a phosphorescent dye or a fluorescent dye. The thermal active delay fluorescent material is introduced to manufacturing of a white light device, the internal quantum efficiency of the material of the type is more than 25%, and the efficiency is high. As no precious metal material is used, the material cost is low.

Description

technical field [0001] The invention belongs to the field of organic electroluminescent devices, and in particular relates to a white light organic electroluminescent device containing a monochromatic light-emitting layer using a novel host material. Background technique [0002] Organic electroluminescent devices have attracted widespread attention due to their thin body, large area, full curing, and flexibility. The huge potential of this aspect has become a research hotspot. [0003] In the electroluminescent process of organic electroluminescent devices, mainly rely on the electronic transition of the host material of the light-emitting layer from the excited state to the ground state to generate light. At room temperature, the luminescence produced by the electronic transition from the triplet excited state back to the ground state is extremely weak, and most of its energy is lost in the form of heat. The luminescence is mainly produced by the electronic transition fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54
Inventor 邱勇张国辉段炼董艳波朱映光胡永岚
Owner BEIJING VISIONOX TECH
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