Efficient Greenish Blue Electrochemiluminescence from Fluorene and Spirobifluorene Derivatives
摘要:
The spectroscopic and electrochemical behavior as well as electrogenerated chemiluminescence (ECL) of a series of donor g-pi-donor derivatives bearing triphenylamine groups as donor connected to a fluorene, 2,7-bis-(4-(N,N-diphenylamino)phen-1-yl)-9,9'-dimethylfluorene (1), or spirobifluorene core, 2,7-bis-(4-(N,N-diphenylamino)phen-1-yl)-9,9'-spirobifluorene (2) and 2,2',7,7'-tetrakis(4-(N,N-diphenylamino)phen-l-yl)-9,9'-spirobifluorene (3), were investigated. Besides a high photoluminescence (PL) quantum yield in solution (between 81 and 87%), an efficient radical ions annihilation process induces intense greenish blue ECL emission that could be seen with the naked eye. Only the tetrasubstituted spirobifluorene derivative (compound 3) shows weak ECL obtained by a direct annihilation mechanism. Because the energy of the annihilation reaction is higher than the energy required to form the singlet excited state, the S-route could be considered the pathway followed by the ECL process in these molecules. The ECL emissions recorded by direct ion-ion annihilation show two bands compared to the single structureless PL band. The ECL spectra obtained by a coreactant approach using benzoylperoxide as a coreagent show no differences relative to that produced by annihilation, except for an increasing of ECL intensity for all compounds.
FLUORENYLENE COMPOUND AND ORGANIC LIGHT-EMITTING DEVICE USING SAME
申请人:SAITOH AKIHITO
公开号:US20070155998A1
公开(公告)日:2007-07-05
A novel pyrenylfluorenylene compound is provided which is represented by the general formula (1):
提供一种新型的芘基芴烯化合物,其通式表示为(1):
ORGANIC LIGHT EMITTING DEVICE
申请人:LG Chem, Ltd.
公开号:EP3579292B1
公开(公告)日:2020-08-05
ORGANIC ELECTROLUMESCENCE DEVICE
申请人:Hosokawa Chishio
公开号:US20070142671A1
公开(公告)日:2007-06-21
Materials for organic electroluminescence devices are represented by following general formula [1]:
wherein A represents a chrysene group, X
1
to X
4
each independently represent a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, X
1
and X
2
may be bonded to each other, X
3
and X
4
may be bonded to each other, Y
1
to Y
4
each independently represent an organic group represented by general formula [2], a to d each represent an integer of 0 to 2 and, a+b+c+d≧0;
general formula [2] being:
wherein R
1
to R
4
each independently represent hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, cyano group or form a triple bond by a linkage of R
1
and R
2
or R
3
and R
4
, Z represents a substituted or unsubstituted aryl group having 6 to 20 carbon atoms and n represents 0 or 1.
PYRENE DERIVATIVE AND ORGANIC ELECTROLUMINESCENCE DEVICE MAKING USE OF THE SAME
申请人:Ito Mitsunori
公开号:US20090058270A1
公开(公告)日:2009-03-05
Provided is an organic electroluminescence device including one or two or more organic thin-film layers having at least a light emitting layer interposed between a negative electrode and a positive electrode, in which the light emitting layer contains a pyrene derivative of a specified structure and an amine compound of a specified structure. The organic electroluminescence device excels in heat resistance, ensures long life and high luminous efficiency, and is capable of emitting blue, green and red lights.
ASYMMETRIC FLUORENE DERIVATIVE AND ORGANIC ELECTROLUMINESCENT ELEMENT CONTAINING THE SAME
申请人:Ito Mitsunori
公开号:US20090261711A1
公开(公告)日:2009-10-22
Provided is an organic electroluminescence device which includes an organic thin film layer composed of one or more layers including at least one light emitting layer, the organic thin film layer being interposed between a cathode and an anode, in which at least one layer of the organic thin layer contains an asymmetric fluorene-based derivative compound of a specific structural formula and an amine compound of a specific structural formula. This organic electroluminescence device has excellent heat resistance and a long lifetime and can emit any of blue, green, and red lights at a high luminous efficiency.