Papers by Keyword: Fluorene

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Authors: Yong Sheng E
Abstract: Fluorene is a basic chemical raw material, which has wide applications.This paper introduces the current fluorene technology of extration and purification from wash oil. Use the after-cut of wash oil as raw material, get fluorene by distillation and solvent crystallization. The content of fluorene is higher than 97%.The total yield is 72.24%, which is higher than current domestic production levels.
Authors: Wen Guan Zhang, Lian Qin, Sheng Min Zhao

Two iridium complexes, orange emitter bis[2-(9, 9-diethylfluoren-2-yl)-5-trifluoromethyl- pyridinto-C3, N] iridium (acetylacetonate) ((fl-5CF3-py)2Ir(acac)) and blue emitter bis(4,6-difluoro- phenylpyridine)(picolinate) iridium(III) (FIrPic), were used. As a single emitting layer at the constant emitting concentration of 8 wt %, EL spectra of the device containing the emitting layer PVK: PBD: (fl-5CF3-py)2Ir(acac) (8 wt %) peaked at 588 nm, the device having the emitting layer PVK: PBD: (fl-5CF3-py)2Ir(acac) (2 wt %): FIrPic (6 wt %) showed the main peak at 588 nm and the weak shoulder peaks at 472 and 500 nm, the device containing the emitting layer PVK: PBD: (fl-5CF3-py)2Ir(acac) (0.2 wt %): FIrPic (7.8 wt %) exhibited the main peak at 580 nm and slightly higher shoulder peaks at 472 and 500 nm. The device having the double emitting layers CBP: (fl-5CF3-py)2Ir(acac) (5 wt %) by spin-coating method and mCP: FIrPic (8 wt %) by vacuum deposition showed the main peaks at 472 and 500 nm, and shoulder peak at 580 nm. Maximum luminances of devices were found to be 14582 cd/m2 (at 16 V), 12497 cd/m2 (at 17 V), 1061 cd/m2 (at 23 V), and 5396 cd/m2 (at 25 V), respectively. The absence of host PVK, PBD, mCP or CBP emission in these devices indicated an efficient energy transfer from the host to the guest complex. Holes and electrons were efficiently recombined in the double emitting layers and an important approach for making WOLEDs was provided in the future.

Authors: Wen Guan Zhang, Hui Pang, Sheng Min Zhao
Abstract: Emission spectrum of Iridium complex bis [2-(9, 9-diethylfluoren-2-yl)-5-trifluoromethyl-pyridinto-C3, iridium (acetylacetonate) (fl-5CF3-py)2Ir (acac) in THF was 589 nm. Two weak UV absorption bands can be assigned to spin-allowed singlet metal-to-ligand charge transfer (1MLCT) and spin-forbidden 3MLCT transitions. The organic light-emitting devices A ITO/PEDOT: PSS/PBD: PVK: (fl-5CF3-py)2Ir (acac) (8 %) /LiF/Al and B ITO/PEDOT:PSS/PBD: PVK: (fl-5CF3-py)2Ir (acac) (8 %) /TPBi/LiF/Al were fabricated using iridium complex as emitter dopant with electro-luminescent spectra at 592 and 588 nm at the bias voltages of 9, 11 and 13V. Devices A and B exhibited luminance of 5265 (at 15 V) and 4098 cd/m2 with Commission International de LEclairage (CIE) coordinates of (0.5805, 0.4185) and (0.5815, 0.4176), respectively. Device B (with TPBi) emitted orange light more efficiently than Device A (without TPBi).
Authors: Xiao Li Ji, Shan Yi Guang, Xin Yan Su, Hong Yao Xu
Abstract: The controllable preparation of nonlinear optical polymers is still one of the research hotspots on nonlinear optical field. In this paper, a triazole functional polymer was designed and achieved by high-efficiency click chemistry method. The structure and properties of the polymer was characterized and evaluated with FTIR, NMR, UV, FL, DLLS and nonlinear optical analyses. The results exhibited that the polymer was successfully synthesized and has favorable nonlinear optical property, its third-order nonlinearity up to 3.66×10-10 esu.
Authors: Zhi Chen, Yi Long Xie, Jin Xing Qiu, Zhong He Chen
Abstract: Three isomers, [4'-(bisphenylamino)[1,1']biphen-2-yl]methylenefluorene (BAB2MF), [4'-(bisphenylamino)[1,1']biphen-3-yl]methylenefluorene (BAB3MF) and [4'-(bisphenylamino)[1,1']biphen-4-yl]methylenefluorene (BAB4MF), were synthesized through Suzuki coupling. The substitution pattern exerts a dramatic influence on the optical property. BAB3MF and BAB4MF are hardly emissive either in the solution or as solid state. On the contrary, BAB2MF emits strongly, especially in the aggregate state with a high fluorescent quantum yield of 69%. Furthermore, BAB2MF shows an aggregation-induced enhanced emission behavior. BAB2MF solid emits at 488 nm, about 60 nm blue-shifted from its solution.
Authors: Wen Guan Zhang, Xiao Lan Shao, Xue Zhen Xie, Sheng Min Zhao
Abstract: Emission spectrum of bis [2-(9, 9-diethylfluoren-2-yl)-5-trifluoromethylpyridinto-C3, iridium (2-picolinic acid) (fl-5CF3-py)2Ir (pic) in THF was 572 nm. Two weak UV absorption bands can be assigned to spin-allowed singlet metal-to-ligand charge transfer (1MLCT) and spin-forbidden 3MLCT transitions. The organic light-emitting devices A ITO/PEDOT: PSS/PBD: PVK: (fl-5CF3- py)2Ir (pic) (12 %) /LiF/Al, B ITO/PEDOT:PSS/PBD: PVK: (fl-5CF3-py)2Ir (pic) (2 %) /TPBi/LiF/Al and C ITO/PEDOT:PSS/PBD: PVK: (fl-5CF3-py)2Ir (pic) (12 %) /TPBi/LiF/Al were fabricated using iridium complex as emitter dopant with electroluminescent spectra at 576, 572 and 576 nm, respectively. Devices A, B and C exhibited maximum luminance of 983 cd/m2 (at 10 V), 3132 cd/m2 (18 V) and 9876 cd/m2 (12V), respectively. Device C exhibited more efficient emission. The devices had excellent stability even at the high concentration.
Authors: Yong Liu, Yu Mei Dai, Xiao Dan Hu
Abstract: The work introduces the spectra of fluorescent derivatives which have been annealed. It’s usually unstable when heated or electrified, showing the red-shift and emerging new emission peak. We analyze the connection between emission peak and temperature. OF3R4, OF3R6, OF4R4, which are characterized by NMR. By contract, different temperatures and materials have similar phenomenon.
Authors: Yuan Fang Hu
Abstract: A compound of 9,9-dipropionitrilefluorene (C19H16N2, Mr=272.34) was synthesized via nucleophilic addition reaction under microwave irradiation (500 w) within short reaction time (8 min), giving high yield of product (87%). Its structure was determined IR, 1H NMR, MS, elemental analysis and X-ray diffraction. The crystal belongs to monoclinic, space group P2(1)/c with a = 21.8358(16),b = 8.9457(7), c = 15.9895(12) Å, β = 105.078(2)o, V= 3015.8(4) Å3, Z=8, Dc= 1.200 g/cm3,μ=0.071 mm-1, F(000)=1152, R=0.0629 and wR = 0.0881 for 3155 observed reflection with I>2σ (I). X-ray analysis reveals that the three fused rings of the fluorene system are almost coplanar and the two propionitrile groups are completely perpendicular to the fused-ring system, the molecular is symmetrical.
Authors: Qiong Hou, Dan Dan Ruan, Lin Tao Hou, Hong Zhu
Abstract: Novel soluble three-component conjugated copolymers are synthesized by palladium- catalyzed Suzuki coupling reaction from 9,9-dioctylfluorene (DOF), 9-ethylhexylcarbazole (Cz) and 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DBT) with Cz composition varying from 1-15 mol% in the copolymer. All of the polymers are soluble in common organic solvents and are highly photoluminescent. The electrochemical, optical, photoluminescent (PL) and electroluminescent (EL) properties of the copolymers were studied. When the hole transmitting material carbazole is introduced into the copolymer PFO-DBT, the hole mobility of the luminescent layer material is improved. The three-component copolymers compared with copolymer PFO-DBT15, Devices made up of these copolymers still emit saturated red light. The highest external quantum efficiency achieved in the device configuration ITO/PEDT/PFO-Cz-DBT15/Ba/Al is 1.81% for the copolymer for 10% Cz content, higher than that of the device made from PFO-DBT15.
Authors: Jian Hua Huang, Xiang Hui Ye, Chuan Lang Zhan, Gui Yu, Yun Qi Liu, Jian Nian Yao
Abstract: Two new conjugated copolymers, PFPh and PFTDP, comprised of alternating 9,9-dioctylfluorene and phthalimide (Ph) or thieno [3, 4-c] pyrrole-4,6-dione (TPD) have been synthesized via Suzuki coupling reaction. Polymeric light-emitting diodes (PLED) were fabricated with an ITO/PEDOT: PSS/PVK/Polymer/BCP/Alq/Ca:Ag configuration. The maximum brightness and maximum current efficiency of PLED are 2600cd/m2 and 2.52 cd/A for PFPh, and 2300cd/m2 and 1.13 cd/A for PFTDP, respectively, which are significantly improved compared with the reported alternating fluorene-unsubstituted phenylene/thiophene systems.
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