Unlock instant, AI-driven research and patent intelligence for your innovation.

Organic electroluminescent device and display device

An electroluminescent device and electroluminescent technology, applied in the direction of electro-solid devices, electrical components, semiconductor devices, etc., can solve the problems of unsatisfactory luminous efficiency, efficiency roll-off, etc., to suppress the DET energy transfer, reduce the injection energy barrier, Improves the effect of FET energy transfer

Active Publication Date: 2019-05-28
YUNGU GUAN TECH CO LTD
View PDF5 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high brightness, the luminous efficiency of organic electroluminescent devices based on phosphorescent materials is not ideal, and the efficiency rolls off seriously.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Organic electroluminescent device and display device
  • Organic electroluminescent device and display device
  • Organic electroluminescent device and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9

[0080] Embodiments 1 to 9 respectively provide an organic electroluminescent device, and the device structure is: ITO / NPB (40nm) / TCTA (10nm) / host material: resonant TADF material: phosphorescent material (30nm) / TPBI (30nm) / LiF(1nm) / Al(100nm), but the materials used in the light-emitting layer are different. The material composition of the specific light-emitting layer is shown in Table 1.

[0081] Table 1

[0082]

[0083] The organic electroluminescent device in the above-mentioned embodiment is subjected to following performance measurement, and test result is as shown in table 2 below:

[0084] Under the same brightness, Keithley K 2400 digital source meter and PR 655 spectral scanning luminance meter were used to simultaneously measure the turn-on voltage and current efficiency of the organic electroluminescent device, and then calculate the external quantum efficiency of the device under different brightness. Among them, the voltage is increased at a rate of 0.1V pe...

Embodiment 10～17

[0106]Embodiments 10 to 17 respectively provide an organic electroluminescent device, and the device structure is: ITO / NPB (40nm) / TCTA (10nm) / host material: resonance type TADF material: traditional fluorescent material (30nm) / TPBI (30nm) ) / LiF(1nm) / Al(100nm). However, the material composition of the light-emitting layer is different. The composition of the materials in the specific light-emitting layer is shown in Table 3, and the device performance test results are shown in Table 4.

[0107] table 3

[0108]

[0109] Table 4

[0110]

[0111]

[0112] According to the test results in Table 4, it can be seen that the organic electroluminescent devices provided in Examples 10 to 17 use wide bandgap materials as host materials, resonant TADF materials as sensitizers, and traditional fluorescent materials as dyes. m 2 The external quantum efficiency is higher than 11.0%, the maximum external quantum efficiency is higher than 12.5%, and the efficiency roll-off is bel...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an organic electroluminescent device and a display device. The organic electroluminescent device comprises a light-emitting layer. Materials of the light-emitting layer comprisea host material, a resonant thermally-activated delayed fluorescent material and a guest material. The efficiency roll-off of the organic electroluminescent device and the display device can be reduced and the service lives of the organic electroluminescent device and the display device are prolonged by using the resonant thermally-activated delayed fluorescent material as a sensitizer in the light-emitting layer.

Description

technical field [0001] The invention relates to an organic electroluminescence device and a display device, belonging to the technical field of organic electroluminescence. Background technique [0002] Organic Light Emitting Diode (OLED) is a device that is driven by current to achieve the purpose of emitting light, and its main characteristics come from the light-emitting layer therein. When an appropriate voltage is applied, electrons and holes will combine in the light-emitting layer to generate excitons and emit light. [0003] Currently, the luminescent materials used in the luminescent layer are mainly traditional fluorescent materials and phosphorescent materials. Among them, due to the defect that the traditional fluorescent materials cannot use triplet excitons, they can only use 25% of singlet excitons to emit light, and the low luminous efficiency is not conducive to reducing device power consumption. Phosphorescent materials can achieve a maximum internal quan...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01L51/54
Inventor 魏金贝李国孟李维维李梦真
Owner YUNGU GUAN TECH CO LTD