A composition formed of a mixture of two compounds having similar thermal evaporation properties that are pre-mixed into an evaporation source that can be used to co-evaporate the two compounds into an emission layer in OLEDs via vacuum thermal evaporation process is disclosed. The first and second compounds can have an evaporation temperature T1 and T2, respectively, of 150 to 350° C., and the absolute value of T1−T2 can be less than 20° C. The first compound can have a concentration C1 in the mixture and a concentration C2 in a film formed by evaporating the mixture in a vacuum deposition tool at a constant pressure between 1×10−6 Torr to 1×10−9 Torr, at a 2 Å/sec deposition rate on a surface positioned at a predefined distance away from the mixture being evaporated, where the absolute value of (C1−C2)/C1 is less than 5%.
Organic Luminescent Compound With Delayed Fluorescence
申请人:UNIVERSAL DISPLAY CORPORATION
公开号:US20140145149A1
公开(公告)日:2014-05-29
Novel organic compounds containing an imidazole core and electron donor and acceptor fragments are provided. By selection of the disclosed donor and acceptor groups, compounds exhibiting small singlet-triplet gaps are obtained. These compounds are useful in OLED devices as host materials or as delayed fluorescent emitters.
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES
申请人:Universal Display Corporation
公开号:US20160149139A1
公开(公告)日:2016-05-26
A composition formed of a mixture of two compounds having similar thermal evaporation properties that are pre-mixed into an evaporation source that can be used to co-evaporate the two compounds into an emission layer in OLEDs via vacuum thermal evaporation process is disclosed. The first and second compounds can have an evaporation temperature T
1
and T
2
, respectively, of 150 to 350° C., and the absolute value of T
1
−T
2
can be less than 20° C. The first compound can have a concentration C
1
in the mixture and a concentration C
2
in a film formed by evaporating the mixture in a vacuum deposition tool at a constant pressure between 1×10
−6
Torr to 1×10
−9
Torr, at a 2 Å/sec deposition rate on a surface positioned at a predefined distance away from the mixture being evaporated, where the absolute value of (C
1
−C
2
)/C
1
is less than 5%.
BLUE FLUORESCENT MATERIAL AND DISPLAY PANEL
申请人:WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.
公开号:US20200373495A1
公开(公告)日:2020-11-26
The present application provides a blue fluorescent material and an OLED display panel, wherein the blue fluorescent material is a tetrahedral structure formed by simultaneously connecting a tert-butyl pyrene and a charge carrier transport unit to a same carbon of cyclohexane; wherein the tert-butyl pyrene increases an external quantum efficiency of the OLED display panel, and the tetrahedral structure increases distance between activated particles and reduces a concentration quenching. The charge carrier transport unit improves a balance of the carrier transfer and alleviates a problem that the current OLED display panel has a low luminous efficiency of the blue light material.