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An organic electroluminescent device with double host structure

An electroluminescence, dual-host technology, applied in the fields of semiconductor devices, electro-solid-state devices, semiconductor/solid-state device manufacturing, etc., can solve the problems of energy loss, efficiency roll-off of organic light-emitting devices, etc.

Active Publication Date: 2020-07-10
JIANGSU SUNERA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, triplet excitons will generate triplet-triplet annihilation (TTA) during the transfer process, resulting in energy loss, which makes the efficiency of organic light-emitting devices roll off.

Method used

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  • An organic electroluminescent device with double host structure
  • An organic electroluminescent device with double host structure
  • An organic electroluminescent device with double host structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] In this embodiment, ITO is used as the anode, Al is used as the cathode, one of the compounds (1)-(51) is used as the first host material of the light-emitting layer 6, and one of the compounds (52)-(121) is used as the light-emitting layer 6 The second host material, DP-1 as the guest doping material, compound HI-1 as the material of hole injection layer 3, compound HT-14 as the material of hole transport layer 4 and electron blocking layer 5, compound ET-14 As the material of the hole blocking / electron transport layer 7 and LiF as the material of the electron injection layer 8, the molecular structural formulas of DP-1, HI-1, HT-14 and ET-14 are as follows:

[0091]

[0092] The specific production steps are as follows:

[0093] a) cleaning the ITO anode layer 2 on the transparent substrate layer 1, ultrasonically cleaning each of deionized water, acetone, and ethanol for 15 minutes, and then treating it in a plasma cleaner for 2 minutes; b) on the ITO anode layer ...

Embodiment 2-16

[0095] Embodiment 2-16 and comparative example 1-11

[0096] Examples 2-16 and Comparative Examples 1-11 have the same manufacturing process as the device of Example 1, and the same substrate material and electrode material are used, and the film thickness of the electrode material is also consistent. The difference is that: the two The two host materials are not the same, and / or the mass ratio of the two host materials is not the same. The specific parameters are shown in Table 1.

[0097] The parameters used in table 1 embodiment 1-16 and comparative example 1-11

[0098]

[0099]

[0100] Compounds A and B in the table are OLED devices of known materials, and the structures of A and B are as follows:

[0101]

[0102] Efficiency and lifetime of the device of each embodiment and comparative example of table 2

[0103]

[0104]

[0105]

[0106] It can be seen from Table 2 that the double-body organic electroluminescent device of the present invention has...

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Abstract

The present invention provides an organic electroluminescent device with a double-host structure, which comprises a hole transport region, an electron transport region and a light-emitting layer, the light-emitting layer comprises a first host material and a second host material, and the first The mass ratio of host material:second host material is 1:99‑99:1. The organic electroluminescent device with a double-host structure provided by the present invention can disperse the triplet excitons on the two hosts by using a double-host material, thereby reducing TTA and reducing the efficiency roll-off of the organic electroluminescent device, so that The efficiency and lifetime of organic electroluminescent devices have been greatly improved.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to an organic electroluminescent device with a double-body structure. Background technique [0002] Organic light emission devices (Organic Light Emission Device, OLED) can be used not only to manufacture new display products, but also to make new lighting products. It is expected to replace the existing liquid crystal display and fluorescent lighting, and has a wide application prospect. OLED is like a sandwich structure, including electrode material film layers, and organic functional materials sandwiched between different electrode film layers. Various functional materials are stacked together according to their uses to form OLEDs. As a current device, when a voltage is applied to the electrodes at both ends of the OLED, and the positive and negative charges in the organic layer functional material film are acted on by the electric field, the positive and negative charges ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54
CPCH10K85/654H10K85/6572H10K50/12
Inventor 缪康健徐凯张兆超李崇
Owner JIANGSU SUNERA TECH CO LTD