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Organic Electroluminescent Devices

An electroluminescent device and electroluminescent technology, which can be applied in the direction of electro-solid devices, electrical components, semiconductor devices, etc., and can solve the problems of reduced efficiency life, hole injection, etc.

Active Publication Date: 2016-05-25
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the case of phosphorescent platinum complexes, this can lead to problems with hole injection and thus to reduced efficiency and / or lifetime of these complexes

Method used

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  • Organic Electroluminescent Devices
  • Organic Electroluminescent Devices
  • Organic Electroluminescent Devices

Examples

Experimental program
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Effect test

Embodiment

[0154] Manufacturing OLEDs

[0155] The OLEDs were fabricated following the general method in WO2004 / 058911, the method being adapted to the circumstances described here (variation of layer thicknesses, materials).

[0156] Data for various OLEDs are given in Examples N1-E20 below (see Tables 1 and 2). To improve handling, a glass plate already coated with structured ITO (indium tin oxide) with a thickness of 150 nm was coated with 20 nm of PEDOT (poly(3,4-ethylenedioxy-2,5-thiophene), spin Coating application; purchased from H.C. Starck, Goslar, Germany). These coated glass plates form the substrate onto which the OLEDs are applied. The OLED has in principle the following layer structure: substrate / optional hole injection layer (HIL) / hole transport layer (HTL) / optional interlayer (IL) / electron blocking layer (EBL) / emitting layer (EML) / hole blocking layer (HBL) / optional electron transport layer (ETL) / optional electron injection layer (EIL) and finally cathode. The cathode ...

Embodiment N1

[0174] For example N1 (HOMO(EBL)–HOMO(EML)=0.65eV), N2, N3 (HOMO(EBL)–HOMO(EML)=0.48eV) and N4 (HOMO(EBL)–HOMO(EML)=0.42 eV), the condition HOMO(EBL)–HOMO(EML)<0.4eV is not satisfied. Accordingly, efficiency and / or roll-off and / or lifetime are impaired if emitter concentrations of <10% by volume are used. This applies both to the use of single matrices (Examples N1, N2, N3) as well as to the use of mixed matrix systems (Example N4). In contrast, OLEDs in which the HOMO difference is less than 0.4 eV at emitter concentrations <10% by volume (Examples E1-E10) show in virtually all cases an optimization in terms of efficiency, roll-off and lifetime. If this is not the case, there is only an insignificant improvement at emitter concentrations ≧10% by volume compared to the optimized case described above. Only at the very low emitter concentration of 1% by volume in Example E1 is a significant impairment of lifetime achieved.

[0175] Meaning of LUMO(EML)

[0176] For examples ...

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Abstract

The invention relates to phosphorescent organic electroluminescent devices having a low concentration of phosphorescent emitters in the emitting layer.

Description

technical field [0001] The invention relates to phosphorescent organic electroluminescent devices having a low concentration of phosphorescent emitters in the emitting layer. Background technique [0002] The structure of organic electroluminescent devices (OLEDs) in which an organic semiconductor is used as functional material is described, for example, in US4539507, US5151629, EP0676461 and WO98 / 27136. The luminescent materials used here are increasingly organometallic complexes which exhibit phosphorescence rather than fluorescence (M.A. Baldo et al., Appl. Phys. Lett. 1999, 75, 4-6). For quantum mechanical reasons, up to four times higher energy and power efficiencies can be achieved using organometallic compounds as phosphorescent emitters. However, there is still a need for improved OLEDs in general, especially OLEDs that exhibit triplet emission (phosphorescence). [0003] In the case of OLEDs according to the prior art, phosphorescent emitters are generally used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H10K99/00
CPCC09B57/00C09B57/008H10K85/636H10K85/631H10K85/30H10K85/654H10K85/6576H10K85/6572H10K85/346H10K85/342H10K85/40H10K50/11H10K2101/40H10K2101/10H10K50/18H10K50/181
Inventor 克里斯托夫·普夫卢姆尼尔斯·舒尔特
Owner MERCK PATENT GMBH
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