419536-33-7Relevant articles and documents
Novel thiophene-containing push-pull chromophores that include carbazole and triphenylamine moieties: study of optical and electrochemical properties
Bakiev, Artur N.,Selivanova, Darya G.,Lunegov, Igor V.,Vasyanin, Aleksandr N.,Maiorova, Olga A.,Gorbunov, Aleksei A.,Shklyaeva, Elena V.,Abashev, Georgii G.
, p. 379 - 387 (2016)
[Figure not available: see fulltext.] Novel carbazole- and triphenylamine-containing alkylidene malononitriles that include thiophene and bithienyl fragments as π-spacers were synthesized. Quantum-chemical calculations of the frontier molecular orbital energies were performed using the B3LYP/6-31G(d) method with regard to solvent. Electronic absorption spectra and fluorescence spectra were recorded for all the obtained compounds; their electrochemical properties were also studied. The experimental energy values of HOMO and LUMO levels were derived from resulting data. Thin films were obtained by the spin coating technique, and their surface morphology was studied using a NTEGRA Prima scanning tunneling microscope.
A bipolar emitting material for high efficient non-doped fluorescent organic light-emitting diode approaching standard deep blue
Fan, Shigen,You, Jing,Miao, Yanqin,Wang, Hua,Bai, Qingyun,Liu, Xicheng,Li, Xianggao,Wang, Shirong
, p. 34 - 42 (2016)
A deep blue emitting compound 9-(4′-(1,4,5-triphenyl-1H-imidazol-2-yl)-[1,1′-biphenyl] -4-yl)-9H-carbazole was designed and synthesized. The emitting compound characters as donor-π-acceptor structure with carbazole as the electron-donor and imidazole as the electron-acceptor. The emitting compound shows high quantum yield (0.87) in solution and good thermal stability. The emitting compound exhibits bipolar transporting characteristics identified by single-carrier devices. The non-doped fluorescent organic light-emitting diode with the emitting compound as emitting layer exhibits emission peak at 420 nm and full width at half maximum of 54 nm, maximum current efficiency of 2.30 cd/A, and maximum power efficiency of 1.52 lm/W, which are higher than most reported deep blue emitters with a y coordinate ≤0.064. The chromaticity coordinate is stable at (0.166, 0.064) with increasing operation voltage.
Red emissive organic light-emitting diodes based on codeposited inexpensive CuI complexes
Ni, Tianchi,Liu, Xiaochen,Zhang, Tao,Bao, Hongliang,Zhan, Ge,Jiang, Nan,Wang, Jianqiang,Liu, Zhiwei,Bian, Zuqiang,Lu, Zhenghong,Huang, Chunhui
, p. 5835 - 5843 (2015)
Inexpensive materials made of abundant natural resources such as CuI complexes are essential to sustain the development of organic light emitting diode (OLED) technology for mass market applications such as solid-state illumination. CuI complexes, however, mostly are neither soluble nor stable toward sublimation, which is a road block for the development of efficient CuI complex based OLEDs using traditional methods of synthesis, sublimation and vacuum evaporation. In this work, two isoquinolyl carbazole (CIQ) compounds 9-(8-(carbazol-9-yl)isoquinolin-5-yl)-carbazole (DCIQ) and 9-(4-(5-(4-(carbazol-9-yl)phenyl)isoquinolin-8-yl)phenyl)-carbazole (DCDPIQ) were synthesized to codeposition with copper iodide (CuI) to form red emissive dimeric CuI complex doped film in situ, which could be utilized directly as the emissive layer (EML) in OLEDs. After a systematic study of the two compounds and their codeposited CuI:CIQ films, as well as optimizing the CuI doping concentration, it is found that red OLEDs can be achieved, showing a maximum emission band, an external quantum efficiency (EQE), a luminance of 643 nm, 3.5%, 3290 cd m-2 for DCIQ, and 635 nm, 3.6%, 853 cd m-2 for DCDPIQ, respectively.
COMPOUND AND ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME
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Paragraph 0143; 0146-0148, (2020/07/29)
The present invention provides a compound of chemical formula 1 and an organic light emitting device comprising the same. The compound according to an embodiment of the present invention has excellent lifespan characteristics and can have high luminous efficiency even at a low driving voltage.COPYRIGHT KIPO 2020
Achieving non-doped deep-blue OLEDs by applying bipolar imidazole derivatives
Jia, Yi,Wu, Sen,Zhang, Yuteng,Fan, Shigen,Zhao, Xiaoming,Liu, Hongli,Dong, Xiaofei,Wang, Shirong,Li, Xianggao
, p. 289 - 296 (2019/04/13)
In this work, we designed and synthesized two novel bipolar deep-blue emitting materials, 2-(4'-(9H-carbazol-9-yl)-[1,1′-biphenyl]-4-yl)-1 (4(tri-fluoromethyl) phenyl)-1H-phenanthro[9,10-d] imidazole (CzB-FMPPI) and 9-(4'-(4,5-diphenyl-1 (4-(trifluoromethyl) phenyl)-1H-imidazole-2-yl)-[1,1′-biphenyl]-4-yl)-9H-carbazole (CzB-FMPIM). Among them, carbazole and phenanthroimidazole are bridged linkage by the biphenyl ring and act as electron-donating part. The CF3-substituted phenyl ring applies as strong electron-withdrawing moiety. The exhibit highly twisted molecular configuration of two compounds efficiently shorten π-conjugation and inhibit intermolecular interaction, resulting in superior thermal stability and deep blue emission. High decomposition temperature of 431 °C and 414 °C, glass transition temperature of 150 °C and 135 °C for CzB-FMPPI and CzB-FMPIM, respectively, had been achieved. As a consequence of breaking the conjugation of phenanthroimidazole chromophore, CzB-FMPIM achieves an 8 nm blue-shifted emission compared with CzB-FMPPI. CzB-FMPPI exhibits a higher relative fluorescence quantum yield of 92.5% than 83.3% of CzB-FMPIM. Moreover, bipolar property was observed in both compound and homogeneous amorphous films were deposited and applied in the non-doped deep-blue OLEDs. The devices based on two emitters showed maximum luminance of 6667 cd/m2 and 3084 cd/m2, maximum EQE of 4.10% and 3.17%, respectively. Commission International de l'éclairage (CIE) coordinates of CzB-FMPIM based device achieved (0.15, 0.07) which is extremely close to the NTSC standard blue CIE (0.14, 0.08).
