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• 86-74-8 9H-carbazole 
• 92-86-4 4-(4-bromophenyl)bromobenzene 

Relevant academic research and scientific papers

Starburst 4,4′,4′′-tris(carbazol-9-yl)-triphenylamine-based deep-blue fluorescent emitters with tunable oligophenyl length for solution-processed undoped organic light-emitting diodes

On the basis of a well-known hole transporting material, namely 4,4′,4′′-tris(carbazol-9-yl)-triphenylamine (TCTA), a series of star-shaped deep-blue fluorescent emitters (2P-TCTA, 3P-TCTA, 4P-TCTA and 5P-TCTA) have been successfully developed via a simpl

Efficient non-doped blue light emitting diodes based on novel carbazole-substituted anthracene derivatives

In this study, we synthesized three anthracene derivatives featuring carbazole moieties as side groups - 2-tert-butyl-9,10-bis[4-(9-carbazolyl) phenyl]anthracene (Cz9PhAnt), 2-tert-butyl-9,10-bis{4-[3,6-di-tert- butyl-(9-carbazolyl)]phenyl}anthracene (tCz9PhAnt), and 2-tert-butyl-9,10-bis{4′-[3,6-di-tert-butyl-(9-carbazolyl)]biphenyl-4-yl} anthracene (tCz9Ph2Ant) - for use in blue organic light emitting devices (OLEDs). The anthracene derivatives presenting rigid and bulky tert-butyl-substituted carbazole units possessed high glass-transition temperatures (220 °C). Moreover, the three anthracene derivatives exhibited strong blue emissions in solution, with high quantum efficiencies (91%). We studied the electroluminescence (EL) properties of non-doped OLEDs incorporating these anthracene derivatives, with and without a hole-transporting layer (HTL). OLEDs incorporating an HTL provided superior EL performance than did those lacking the HTL. The highest brightness (6821 cd/m2) was that for the tCz9PhAnt-based device; the greatest current efficiency (2.1 cd/A) was that for the tCz9Ph2Ant-based device. The devices based on these carbazole-substituted anthracene derivatives also exhibited high color purity.

Thermal activation delayed fluorescence material, preparation and applications thereof

The invention relates to a thermal activation delayed fluorescence material, preparation and applications thereof. The activation delayed fluorescence material is a 9,10-diboron anthracene derivative,and has a structure represented by the following general formula I, wherein in the general formula I, R1, R2, R3 and R4 are respectively and independently selected from H and C1-C4 alkyl, and R5 andR6 are nitrogen-containing electron donating groups. The invention provides a novel thermal activation delayed fluorescence material, wherein a D-A-D rod-like structure is formed by using the boron-containing part in the middle of the thermal activation delayed fluorescence material as an electron acceptor (A) and using the nitrogen-containing parts at the two ends as electron donor parts (D), andthe rod-like structure is beneficial to horizontal dipole orientation, so that the light emitting rate of a device can be improved so as to improve external quantum efficiency. The thermal activationdelayed fluorescence material can be applied to organic light-emitting diodes, organic field effect transistors, organic thin film solar cell elements and the like, and particularly relates to an organic light-emitting diode light-emitting layer object material.

Dendritic organometallic complexes as well as preparation method and application thereof

The present invention provides a preparation method of dendritic organometallic complexes. The method comprises the following step: performing a Suzuki reaction on one dendrimer unit containing boricacid or borate represented by a formula (I) and one meta

Simultaneously enhancement of quantum efficiency and color purity by molecular design in star-shaped solution-processed blue emitters

A series of fluorene-free bipolar star-shaped molecules, Sn-Cz-OXD (n = 1-5), with increasing conjugated length in branches were synthesized as high efficient blue emitters for OLEDs. With the extension of conjugated branches, the solid PL quantum efficiency and external quantum efficiency of Sn-Cz-OXD significantly increased with longer spacer, while the emission spectrum of these materials exhibited a blue-shift with enhanced color purity due to the unique molecular design. All materials maintained exceptionally high thermal stability after prolonged heat treatment at 150 °C in air. The photophysical, electrochemical, thermal properties of these emitters were studied in relation to the molecular structure. Nondoped device based on S4-Cz-OXD with structure ITO/PEDOT:PSS/EML/TPBI/LiF/Al emitted stable pure blue light with CIE coordinates of (0.157, 0.146). It exhibited high current efficiency and external quantum efficiency of 4.96 cd A-1 and 4.20%, respectively. These values are among the best results for solution-processed non-doped blue device based on fluorene-free materials, indicating its potential for commercial applications.

Carbazole derivative, and preparation method and organic electroluminescent device thereof

The invention provides a carbazole derivative, and a preparation method and an organic electroluminescent device thereof. The carbazole derivative is characterized in that a substituent group is improved based on an asymmetric carbazole derivative in orde