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Organic electroluminescent devices of laminated construction

An electroluminescent device, organic technology, applied in the direction of electro-solid devices, electrical components, organic chemistry, etc., can solve the problems of high evaporation temperature, low electron mobility of organic materials, difficult process implementation, etc., and achieves simple preparation process, Effects of low film formation temperature and improved device power efficiency

Active Publication Date: 2009-06-10
TSINGHUA UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of the conventional N / P connection layer is that the organic materials in the N-type layer have low electron mobility, while the P-type layer is mostly inorganic materials, the required evaporation temperature is high, and the process is difficult to implement.

Method used

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  • Organic electroluminescent devices of laminated construction
  • Organic electroluminescent devices of laminated construction
  • Organic electroluminescent devices of laminated construction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Device structure:

[0042] Device1: ITO / HIL / EL1 / Li 3 N / Al

[0043] Device2-6: ITO / HIL / EL1 / N / P / EL2 / Li 3 N / Al

[0044] Where EL1 in Device 2-6 is: NPB(40nm) / Alq3(30nm) / (compound C1, C11, C21, C31 or Alq 3 )(20nm)

[0045] N / P in Device 2-6 is: (compound C1, C11, C21, C31 or Alq 3 ) doped with 10% Li3N / V 2 o 5

[0046] Device: EL2 in 2-6 is: NPB(40nm) / Alq 3 (30nm) / (compound C1, C11, C21, C31 or Alq3 )

[0047] With the ITO conductive glass substrate etched with specific patterns as the substrate, the substrate is ultrasonically cleaned in deionized water containing cleaning solution. The temperature of the cleaning solution is about 60°C, and then the cleaned substrate is cleaned Dry it, put it into the evaporation chamber to evaporate the hole injection layer, EL1, the compound Li3N / P connection layer, E12, and the electrode in sequence, and the pressure of the chamber during the evaporation process is lower than 5.0×10 -3 Pa. In this embodiment, the N-type co...

Embodiment 2

[0050] Device structure:

[0051] Device 7: ITO / HIL / EL3 / Li 3 N / Al

[0052] Device 8: ITO / HIL / EL3 / N / P / EL4 / Li 3 N / Al

[0053] Where EL3 is: NPB(40nm) / GH:GD / compound C1(20nm)

[0054] N / P is: Compound C1: 10% Li3N / HAT

[0055] EL4 is: NPB(40nm) / GH:GD / compound C1(20nm)

[0056] With the ITO conductive glass substrate etched with specific patterns as the substrate, the substrate is ultrasonically cleaned in deionized water containing cleaning solution. The temperature of the cleaning solution is about 60°C, and then the cleaned substrate is cleaned Dry it, put it into the evaporation chamber to evaporate the hole injection layer, EL1, N / P connection layer, E12, and electrode in sequence, and the pressure of the chamber during the evaporation process is lower than 5.0×10 -3 Pa. In this embodiment, the N-type connection layer is prepared by dual-source doping and co-evaporation of compound C1 and lithium nitride.

[0057] from figure 2 It can be seen that the current effici...

Embodiment 3

[0062] Device 9: ITO / HAT / EL5 / Alq 3 :Li / Al

[0063] Device 10: ITO / m-MTDATA:F1TCNQ / EL5 / Alq 3 : Doped with 10% Li / m-MTDATA: F1TCNQ / EL5 / Alq 3 : Li / Al, where N / P is Alq 3 : doped with 10% Li / m-MTDATA:F1TCNQ.

[0064] Device 11: ITO / MoO 3 / EL5 / compound C1: doped with 10% Li 3 N / MoO 3 / EL5 / Compound C1:Li 3 N / Al, where N / P is compound C1: doped with 10% Li 3 N / MoO 3 .

[0065] Device 12: ITO / m-MTDATA:F1TCNQ / EL5 / Compound C1: Doped with 10% Li 3 N / m-MTDATA: F1TCNQ / EL5 / Compound C1: doped with 10% Li 3 N / Al, where N / P is compound C1: doped with 10% Li 3 N / m-MTDATA:F1TCNQ.

[0066] Device 13: ITO / HAT / EL5 / Compound C1: doped with 10% Li 3 N / HAT / EL5 / compound C1: doped with 10% Li 3 N / Al, where N / P is compound C1: doped with 10% Li 3 N / HAT.

[0067] Device 14: ITO / HAT / EL5 / compound C1: doped with 70% Li 3 N / HAT / EL5 / compound C1: doped with 70% Li 3 N / Al, where N / P is compound C1: doped with 70% Li 3 N / HAT.

[0068] EL5 is: NPB / Alq 3 :C545T / Alq 3

[0069] Table 2 is a com...

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Abstract

The invention discloses a laminated organic electroluminescent device, which comprises a pair of electrodes and an organic luminescent medium arranged between the electrodes. The organic luminescent medium comprises at least two luminescent units. A connection layer is arranged between the luminescent units. The connection layer comprises at least one selected from compounds in the general formula I or II, wherein Ar is mid-condensed-nuclei aromatics of which the number of carbon atoms is selected from 6 to 30, or mid-fused-heterocycle aromatics of which the number of carbon atoms is selected from 6 to 30; n is an integer selected from 2 to 4; and alkali metal materials or alkali metal compounds are simultaneously doped. The device connects two or more than two luminescent units together so as to play a role as a charge generation layer. The device with N laminated luminescent units is N times the current efficiency of a single luminescent-layer device, and gains certain improvement of power efficiency as well. In addition, compared with the prior laminated device, the connection-layer material selected by the electroluminescent device has the advantages of lower film-forming temperature and relatively simple preparation process.

Description

technical field [0001] The invention relates to a novel organic electroluminescent device, in particular to a stacked structure organic electroluminescent device prepared by adopting novel materials. Background technique [0002] Organic electroluminescent devices have attracted widespread attention due to their thin body, large area, full curing, and flexibility, and have important applications in the fields of display and lighting. [0003] In order to obtain high current efficiency, people have designed a method of superimposing two light-emitting units, such as Adachi et al. Japanese Journal of applied physics, 27, L269 (1988) and ISSN / 007-0966X / 07 / 3801-0871- 2007SID, ISSN / 007-0966X / 07 / 3801-0089-2007SID), etc. refer to figure 1 , the laminated device mainly connects two or more adjacent light-emitting devices through the connecting layer. The connection layer can also serve as a charge generation layer, and the performance of this layer will directly affect the photoe...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54C07D213/06C07D401/10C07D401/14C07D417/14C07D409/14
Inventor 邱勇张国辉段炼李银奎
Owner TSINGHUA UNIV
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