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An organic and device technology, applied in the field of organic electroluminescent devices, to achieve the effects of fast reverse intersystem crossing rate, excellent hole and electron transport performance, and large reverse intersystem crossing rate
Active Publication Date: 2018-06-22
BEIJING ETERNAL MATERIAL TECH +1
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[0006] However, with the deepening of the research, it was found that the energy difference between the excited singlet state and the excited triplet state is not a sufficient condition for the material to have TADF properties (see Non-Patent Document 1)
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[0152] The preparation process of the organic electroluminescent device of device embodiment 1 is as follows:
[0153] The glass plate coated with ITO (50nm) transparent conductive layer was ultrasonically treated in a commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in acetone:ethanol mixed solvent (volume ratio 1:1), and cleaned in a clean environment. Baking to completely remove moisture, cleaning with UV light and ozone, and bombarding the surface with a beam of low-energy cations;
[0154] Place the above-mentioned glass substrate with the anode in a vacuum chamber, and evacuate to 1×10 -5 ~9×10 -3 Pa, 2-TNATA[4,4',4"-tris(N,N-(2-naphthyl)-phenylamino)triphenylamine] was vacuum evaporated on the above-mentioned anode layer film to form a void with a thickness of 60nm. Hole injection layer; the compound NPB is vacuum evaporated on the hole injection layer to form a hole transport layer with a thickness of 20nm, and the evaporation rate is 0....
Embodiment 2～14
[0160] Examples 2-14 adopt the same device manufacturing method as in Example 1, the only difference is that the host material compound C1 is replaced by equivalent compounds C2, C4, C10, C11, C12, C19, C20, C34, C49, C55 , C56, C67 and C73.
Embodiment 15～18
[0162] The structure of the organic electroluminescence device that embodiment 15~18 prepares is as follows: ITO (50nm) / 2-TNATA (60nm) / NPB (20nm) / mCBP: Cx (30%) (30nm) / Bphen (20nm) / LiF(0.5nm) / Al(150nm).
[0163] where Cx are respectively C1, C2, C10 and C12.
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Abstract
The invention provides an organic compound with a specific structure. The organic compound is characterized by being shown as a general formula (I): the formula (I) is shown in the description; in theformula (I), X1 to X8 are respectively independently selected from CR1 or N respectively, wherein at least one is an N atom; L is a single bond and is C5 to C12 substituted or unsubstituted arylene and heteroarylene; R1 is selected from hydrogen, C1 to C10 aryl or cycloalkyl, C6 to C15 aryl or C6 to C19 condensed ring aryl and at least one is azacarbazole; Ar is substituted or unsubstituted N heterophenyl. The invention discloses an inverse intersystem crossing constant and emission delayed fluorescence rule and the designed compound is used for an organic electroluminescent device, can be used for effectively improving the current efficiency and is an organic electroluminescent material with good performance. The invention also provides the organic electroluminescent device adopting thecompound shown as the general formula.
Description
technical field [0001] The present invention relates to the technical field of organic electroluminescence, and more specifically relates to an organic compound, its application in the field of organic electroluminescence and an organic electroluminescence device using it in a light-emitting layer. Background technique [0002] Under the condition of electro-excitation, organic electroluminescent materials will produce 25% singlet state and 75% triplet state, and traditional fluorescent materials can only use singlet state excitons due to spin prohibition. In order to utilize triplet excitons, researchers have proposed many methods, the most notable of which is the utilization of phosphorescent materials. However, due to the use of rare heavy metals in phosphorescent materials, the materials are relatively expensive, which is not conducive to the reduction of product costs. [0003] The thermally activated delayed fluorescence (TADF) material based on the triplet-singlet tr...
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