Red light organic electroluminescence device

A luminescent and electromechanical technology, applied in the field of red organic electroluminescent devices, can solve the problems of high doping concentration in the red OLED light-emitting layer, achieve the effects of reducing roll-off, improving efficiency, and ensuring full utilization

Active Publication Date: 2018-05-08
KUNSHAN NEW FLAT PANEL DISPLAY TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention lies in the problem of high doping concentration in the red-light OLED light-emitting layer in the prior art, and further provides a red-light organic electroluminescent device, which uses a thermally activated delayed fluorescent material doped in the host material, Recombination of excitons in the light-emitting region is limited, the efficiency roll-off phenomenon is effectively suppressed, and the device efficiency is increased to 18% to 23%.

Method used

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  • Red light organic electroluminescence device
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  • Red light organic electroluminescence device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] like image 3 As shown, a red light organic electroluminescent device provided by the present invention includes a substrate, and a first electrode layer 01, a light emitting layer 04 and a second electrode layer 07 sequentially formed on the substrate, the first electrode A first organic functional layer is arranged between the layer 01 and the light-emitting layer 04 , and a second organic functional layer is arranged between the light-emitting layer 04 and the second electrode layer 07 . The first organic functional layer is the hole injection layer 02 and / or the hole transport layer 03 , and the second organic functional layer is the electron transport layer 05 and / or the electron injection layer 06 .

[0074] The host material of the device in this embodiment includes a first host material and a second host material, and the dye is a red phosphorescent dye.

[0075] Device 1: ITO / NPB(40nm) / TCTA(10nm) / CBP:50wt%(1-37):3wt%Ir(piq) 2 (acac)(30nm) / Bphen(40nm) / LiF(5nm)...

Embodiment 2

[0084] The structure of the light-emitting device in Example 2 is the same as that of the light-emitting device in Example 1, the difference is that the host material of the light-emitting layer 04 is different, the doping concentration of the red phosphorescent dye is 1 wt%, and the structures of devices 2 to 8 are as follows:

[0085] ITO / NPB(40nm) / TCTA(10nm) / host material: 1wt%Ir(piq) 2 (acac)(30nm) / Bphen(40nm) / LiF(5nm) / Al

[0086] The performance test result of table 4 embodiment 2

[0087]

[0088] The performance of devices 2 to 8 was tested. As shown in Table 4, the red phosphorescent organic electroluminescent device of the present invention uses a hole-type transport material or an electron-type transport material as the first host material, and a heat-activated sensitized fluorescent material As the second host material, and the doping concentration of the host material is different, it can be seen from the table that this kind of red phosphorescent light emittin...

Embodiment 3

[0090] The structure of the light-emitting device in Embodiment 3 is the same as that in Embodiment 1, the difference lies in that the materials of the light-emitting layer are different, and the structures of devices 9 to 16 are as follows:

[0091] ITO / NPB(40nm) / TCTA(10nm) / luminescent layer / LiF(5nm) / Al

[0092] Table 5 embodiment 3 performance test results

[0093]

[0094]

[0095] The performance of devices 9 to 16 was tested. As shown in Table 5, the red phosphorescent organic electroluminescent device of the present invention uses a hole-type transport material or an electron-type transport material as the first host material, and a heat-activated sensitized fluorescent material As the second host material, and the doping concentration of the host material is different, it can be seen from the table that this kind of red phosphorescent light emitting device has high performance, which shows that the device structure protected by the present invention has universal ...

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Abstract

The invention discloses a red light organic electroluminescence device including a substrate, and a first electrode, a light emitting layer and a second electrode layer formed on the substrate in sequence. The light emitting layer includes body material and red phosphorescence dye. The body material includes first body material and second body material. The doping proportion of the second body material is 5 to 50 wt%. The doping proportion of the first body material is 50 to 95wt%. The triplet state energy level of the first body material T1<H1> is greater than 2.7eV while the wide energy gapEg is greater than 3.0 eV. According to the invention, by utilizing the extremely small energy level difference between the triplet state and the singlet state of thermal activation delayed fluorescence material, excitons on the T1 of the body can be transferred to S1 of the body quickly, so that the singlet state excitons and the triplet state excitons can be utilized effectively. Then through Forest energy transfer to phosphor material T1, device efficiency is improved to 18% to 23%.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent devices, in particular to a red light organic electroluminescent device using thermally activated delayed fluorescent materials and common materials as light-emitting main materials. Background technique [0002] The light-emitting layer of the organic electroluminescent device OLED is mainly made of all fluorescent materials, all phosphorescent materials or a mixture of fluorescent materials and phosphorescent materials. After nearly 30 years of development, organic electroluminescent devices (English full name Organic Light Emitting Device, referred to as OLED) as the next generation of lighting and display technology, has a wide color gamut, fast response, wide viewing angle, no pollution, high contrast , Planarization and other advantages have been applied to a certain extent in lighting and display. [0003] Organic electroluminescent devices usually include a cathode, a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54
CPCH10K50/11H10K2101/40H10K50/12H10K50/121H10K2101/10
Inventor 赵菲刘嵩
Owner KUNSHAN NEW FLAT PANEL DISPLAY TECH CENT
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