There is provided an electroactive composition. The composition has (a) a host material having Formula I
and (b) an electroactive dopant capable of electroluminescence having an emission maximum between 500 and 700 nm. In Formula I:
R
1
to R
8
are the same or different and can be H, alkyl, or alkoxy, or adjacent R groups may be joined together to form a 5- or 6-membered aliphatic ring, with the proviso that at least one of R
1
to R
8
is not H,
Ar
1
to Ar
4
are the same or different and are aryl groups,
A is the same or different at each occurrence and can be a single bond or a phenylene group, and
a and b are the same or different and are an integer of 0-2.
NOVEL COMPOUNDS AND USES IN DEVICES
申请人:Universal Display Corporation
公开号:US20160104847A1
公开(公告)日:2016-04-14
This invention discloses a novel multicomponent system or a single compound that is capable of performing triplet-triplet annihilation up conversion process. (TTA-UC) A solution or solid film that comprises this TTA-UC system or compound is provided. This system or compound can be used in an optical or optoelectronic device.
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%.