Organic compound and organic electroluminescent device containing same

Abstract

A compound has a structural formula shown as a formula (1): D-L1-Y-L2-A (1), wherein D is a substituted or unsubstituted donor group; the L1 and L2 are each independently a single bond, a substitutedor unsubstituted C6-C30 arylene group, or a substituted or unsubstituted C3-C30 heteroarylene group; the A is a substituted or unsubstituted receptor group; the Y has a structural formula shown as a formula (2) or (3); the X1 and X2 are the same or different and are independently selected from O, S or Se respectively; X3 is selected from C or Si; the R1 and R2 are respectively and independently selected from halogen, alkyl, substituted or unsubstituted alkoxy, substituted or unsubstituted C6-C30 arylamino or heteroarylamino, substituted or unsubstituted C6-C30 aryl or substituted or unsubstituted C3-C30 heteroaryl; the n1 is any integer from 0 to 5; and the n2 is any integer from 1 to 5.

Description

technical field [0001] The invention relates to an organic compound, which can be used as a light-emitting layer host material of an organic electroluminescent device; the invention also relates to the application of the compound in the organic electroluminescent device. Background technique [0002] Due to many advantages such as self-luminescence, high contrast ratio, low power consumption, etc., organic light-emitting diodes (OLEDs), as a new generation of display and lighting technology, have attracted widespread attention from academia and industry. At present, the industry uses blue fluorescent materials with green and red fluorescent phosphorescent materials to achieve full-color display. However, blue dyes are cheap but inefficient, and phosphorescent dyes are efficient but expensive due to heavy metal content. In 2012, Professor Adachi of Kyushu University in Japan reported a series of thermally activated delayed fluorescence (TADF) materials in Nature, which made ...

AI Technical Summary

Problems solved by technology

Due to the wide band gap and hole-biased unipolar transport properties of common host materials, the exciton injection energy barrier is high and will lead to the deviation of the exciton recombination region under high voltage, resulting in unstable electroluminescence spectrum and efficiency roll-off serious

In order to solve the shortcomings of host unipolar transport, two materials with hole transport ability and electron transport ability are premixed or evaporated separately to form an exciplex (Exciplex) type host, thereby greatly improving the performance of the device, but the process Complicated operation limits its further development

In addition, Organic Electronic 15 (2014) 2763-2768 reported a series of host materials (PTC and POTA) that conjugated donors and acceptors, but the corresponding devices have high turn-on voltage and poor efficiency

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