1228595-79-6Relevant articles and documents
Hydrogen evolution from water using heteroatom substituted fluorene conjugated co-polymers
Aitchison, Catherine M.,Bai, Yang,Cooper, Andrew I.,Sprick, Reiner Sebastian,Wilbraham, Liam,Woods, Duncan J.,Zwijnenburg, Martijn A.
, p. 8700 - 8705 (2020)
The photocatalytic performance of fluorene-type polymer photocatalysts for hydrogen production from water in the presence of a sacrificial hole scavenger is significantly improved by the incorporation of heteroatoms into the bridge-head. This improvement
Synthesis and characterization of arylamino end-capped silafluorenes for blue to deep-blue organic light-emitting diodes (OLEDs)
Chen, Shao Fu,Tian, Yuan,Peng, Jinghong,Zhang, Huarong,Feng, Xin Jiang,Zhang, Haixia,Xu, Xinjun,Li, Lidong,Gao, Jianhua
, p. 6822 - 6830 (2015)
Diphenylamino- or cabazolyl-endcapped silafluorene derivatives which show a wide energy band gap, a high fluorescence quantum yield and high stability have been designed, synthesized, and characterized. Double layer electroluminescent devices of these silafluorene derivatives exhibited efficient blue emission. The non-doped double layer OLEDs containing TDMS, TDPS, CDMS, or CDPS exhibited better electroluminescence efficiencies than those of the devices using the reference emitter DPFL-NPB, among which the best device was with TDPS, which showed a maximum current efficiency of 1.62 cd A-1 and an external quantum efficiency (EQE) of 1.36%. The solution processed device using TDPS as dopant exhibited a high performance with an EQE of 2.48% and an obviously low turn-on voltage of 4 V, when compared to the results of the reference device. The replacement of the carbon atom of the fluorene unit with a silicon atom could lower the energy gap effectively and improve the thermal stability as well as optical performances. The results indicate that the end-capped arylamino groups affect the organic light-emitting diode (OLED) performances greatly and aryl or alkyl substitution on the 9-position of a silafluorene unit is also crucial to the OLED performances of this kind of silafluorene.
Low-band gap copolymers based on diketopyrrolopyrrole and dibenzosilole and their application in organic photovoltaics
Ha, Yeon Hee,Hong, Jisu,An, Tae Kyu,Yun, Hui-Jun,Kim, Kyunghun,Park, Chan Eon,Kim, Yun-Hi,Kwon, Soon-Ki
, p. 73 - 81 (2017)
We report donor-acceptor copolymers incorporating electron-donating dimethylsilole and electron-withdrawing diketopyrrolopyrrole (DPP) units. To investigate effects of alkyl chain attached to the DPP unit, 2-decyltetradecyl (24-alkyl) group and 7-decylnonadecyl (29-alkyl) with linear space group were introduced to DPP units. Two polymers, P24DPP-Silole and P29DPP-Silole, exhibited low band gap of 1.46 and 1.36 eV, respectively, and low-lying lowest unoccupied molecular orbital (LUMO) energy level of ?3.85 eV. Photovoltaic devices employing P24DPP-Silole and P29DPP-Silole exhibited the highest power conversion efficiencies of 4.17% and 4.33%, respectively, with 1-chloronaphthalene (CN) as a processing additive. Morphological analyses were conducted with atomic force microscopy (AFM), transmission electron microscopy (TEM), and grazing incidence wide-angle x-ray scattering (GIWAXS) to investigate the effects of different alkyl chain on DPP units and processing additive. The analyses revealed that the addition of CN led to favorable phase separation and increased the degree of crystallinity in blend films. This study demonstrates that the copolymerization of DPP and dibenzosilole units is an effective means of narrowing the optical band gap. Furthermore, the length of alkyl chains on DPP units did not significantly affect on the photovoltaic performances and bulk heterojunction morphologies.
Organic electroluminescent device with hole blocking layer
-
Paragraph 0087-0091, (2020/03/12)
The organic electroluminescent device, comprises a cathode, electron transport layer, a hole transport layer, a hole blocking layer, a light emitting layer, and an anode, wherein the hole blocking layer comprises one or more compounds (I) represented by Formula : In-flight, L1 , L2 And L3 A single bond, C is independently selected from a single bond, respectively. 1 - C12 Alkylene, C1 - C8 Alkyleneoxy, C6 - C30 Arylene, C5 - C30 Nitrogen-containing heteroarylene ;Ar1 , Ar2 And Ar3 Independently selected from C6 - C30 Aryl, C5 - C30 Heteroaryl, Ar1 Any substitution site, of the phenyl ring which may be substituted for it is when L. 1 , L2 , L3 , Ar1 , Ar2 , Ar3 Where any one or more of the substituents in substituents, have substituents, the substituents are independently selected from halogen, C. 1 - C10 Alkyl or cycloalkyl, alkenyl, C1 - C6 Alkoxy or thioalkoxy, C6 - C30 Aryl, contains heteroatoms selected from N, O, S, Si and C. 6 - C30 The aryl ;X is selected from O, S or Se.