Synthesis, Characterization and Optical Properties Based on a Novel Re(I) Emitter with Bulky Building Block

2011 ◽  
Vol 295-297 ◽  
pp. 373-377 ◽  
Author(s):  
Tie Nan Zang ◽  
Xiao Li ◽  
Lian Shui Yu ◽  
Ji Ping Ru ◽  
Hai Jun Chi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photophysical Properties ◽  
Decomposition Temperature ◽  
Organic Light Emitting Diodes ◽  
Absorption Bands ◽  
Light Emitting ◽  
H Nmr ◽  
Rhenium Complex ◽  
Organic Light ◽  
Ligand Charge Transfer

A novel rhenium complex material, i.e., Re-APPP, (APPP, 2,3-acenaphtho[1,2-b]pyrazino [2,3-f][1,10]phenanthroline) was designed, synthesized in five steps from commercially available starting materials and characterized by FTIR,1H NMR and mass spectroscopy. The photophysical properties of this complex were studied. The absorption bands centered at ca. 326, 366 and 450nm of Re-APPP were attributed to the ligand-centered p→p* transition and the metal-to-ligand charge transfer dπ(Re)→π*(APPP) transition, respectively. Re-APPP was thermally stable with high decomposition temperature of 302°C. The organic light-emitting diodes using Re-APPP as a dopant emitter with the structures of ITO/m-MTDATA(10nm)/NPB(20nm)/CBP: Re-APPP(30nm)/BCP(10nm)/Alq3(30nm)/LiF(1nm)/Al(100nm) were fabricated and a broad electroluminescent peak at 550nm was observed. More importantly, the devices exhibited very small efficiency roll-off of only ca.45% which was probably attributed to its short luminescent lifetime.

Tuning Color of Charged Iridium (III) Complexes with a Spiro N,N'-Bidentate Ligand

2012 ◽  
Vol 229-231 ◽  
pp. 192-196 ◽  
Author(s):  
Kattaliya Mothajit ◽  
Kittiya Wongkhan ◽  
Rukkiat Jitchati
Keyword(s):  
Charge Transfer ◽  
Photophysical Properties ◽  
Bidentate Ligand ◽  
Organic Light Emitting Diodes ◽  
Photoluminescence Spectra ◽  
Absorption Bands ◽  
Light Emitting ◽  
Organic Light ◽  
Ligand Charge Transfer ◽  
Emission Color

Organic light emitting diodes (OLEDs), charged iridium(III) complexes, spiro ligand Abstract. We report the synthesis, characterization and photophysical properties of a cationic cyclometalated Ir(III) complexes of general formula [Ir(ppy)2(spbpy)]+Cl, [Ir(diFppy)2(spbpy)]+Cland [Ir(thiopy)2(spbpy)]+Clwhere ppy, spbpy, diFppy and thiopy are 2-phenylpyridine, 4,5-diaza-9,9′-spirobifluorene, 2-(2′,4′-difluorophenyl)-pyridine and 2-(thiophen-2′-yl)-pyridine, respectively. The complexes exhibit strong absorption bands in the UV region in solution spectra, due to spin-allowed ligand-centred (LC) and weaker absorption bands at longer wavelengths from metal-to-ligand charge transfer (MLCT). The photoluminescence spectra of all the complexes were characterised by a combination of 3MLCT and3π→π*states. The emission color of a cationic cyclometalated Ir(III) complexes in solution have successfully tuned from green to orange (501-582 nm).

Probing photophysical properties of isomeric N-heterocyclic carbene Ir(iii) complexes and their applications to deep-blue phosphorescent organic light-emitting diodes

2017 ◽  
Vol 5 (7) ◽  
pp. 1651-1659 ◽  
Author(s):  
Yang-Jin Cho ◽  
So-Yoen Kim ◽  
Jin-Hyoung Kim ◽  
Jiwon Lee ◽  
Dae Won Cho ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Light Emitting Diodes ◽  
Photophysical Properties ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
Blue Phosphorescent

The photophysical and electrochemical properties of the two isomeric N-heterocyclic carbene Ir(iii) complexes were investigated.

A benzoindole-cored building block for deep blue fluorescent materials: synthesis, photophysical properties, and applications in organic light-emitting diodes

2020 ◽  
Vol 8 (47) ◽  
pp. 16870-16879
Author(s):  
Shanghui Ye ◽  
Congjin Wu ◽  
Pengfei Gu ◽  
Tai Xiang ◽  
Senyu Zhang ◽  
...  
Keyword(s):  
Building Block ◽  
Photophysical Properties ◽  
Organic Light Emitting Diodes ◽  
Efficiency Curve ◽  
Materials Synthesis ◽  
High Luminance ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
Fluorescent Materials

A new aromatic 2-(pyridine-4-yl)-3-phenyl-1H-benzo[g]indole core has been designed to build a series of D–π–A–π–D deep blue fluorescent materials in a Ψ-type configuration, which exhibit extremely stable efficiency curve at high luminance.

Stable Electrophosphorescent Emission of Fluorenyltrifluoromethyl-Pyridine Iridium 2-Picolinic Acid at High Concentration

2013 ◽  
Vol 395-396 ◽  
pp. 96-99
Author(s):  
Wen Guan Zhang ◽  
Xiao Lan Shao ◽  
Xue Zhen Xie ◽  
Sheng Min Zhao
Keyword(s):  
Picolinic Acid ◽  
Iridium Complex ◽  
Maximum Luminance ◽  
High Concentration ◽  
Absorption Bands ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Ligand Charge Transfer ◽  
Excellent Stability

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.

Design, Synthesis and Photophysical Properties of Novel Tetrahedral Carbazole-Bridged Silanes with Benzimidazole Groups

2012 ◽  
Vol 268-270 ◽  
pp. 23-27
Author(s):  
Qing Yu Ma ◽  
Rui Fang Guan ◽  
Guo Zhong Li ◽  
Deng Xu Wang
Keyword(s):  
Photophysical Properties ◽  
Band Gaps ◽  
Organic Light Emitting Diodes ◽  
Design Synthesis ◽  
Light Emitting ◽  
Organic Light ◽  
Host Materials ◽  
Blue Emitters ◽  
Molecular Calculations ◽  
Homo Lumo

Two novel luminescent molecules based on tetrahedral silicon core with the carbazole and benzimidazole groups, bis(6-(1H-benzo[d]imidazol-1-yl)-9-ethyl-9H-carbazol-3-yl)dimethylsilane (1) and bis(6-(1H-benzo[d]imidazol-1-yl)-9-ethyl-9H-carbazol-3-yl)diphenylsilane (2), were designed, synthesized and fully characterized by IR, 1H NMR, 13C NMR and elemental analysis. Thermal results show that these compounds have high thermal stability and glass-transition temperature (Tg). The results based on the photophysical properties and molecular calculations reveal that they are fluorescent with emission in the region of violet to blue and own large HOMO-LUMO band gaps, making them potentials as blue emitters, host materials or charge blocking materials in organic light-emitting diodes (OLEDs) display.

scholarly journals Synthesis, crystal structure and photophysical properties of bis[2,6-difluoro-3-(pyridin-2-yl)pyridine-κN](trifluoromethanesulfonato-κO)silver(I)

2021 ◽  
Vol 77 (12) ◽  
Author(s):  
Suk-Hee Moon ◽  
Sanghyun Paek ◽  
Youngjin Kang
Keyword(s):  
Title Compound ◽  
Photophysical Properties ◽  
Three Dimensional ◽  
Organic Light Emitting Diodes ◽  
Broad Emission Band ◽  
Supramolecular Network ◽  
Coordination Environment ◽  
Light Emitting ◽  
Organic Light ◽  
Broad Emission

In the title compound, [Ag(CF3SO3)(C10H6F2N2)2], the AgI centre adopts a highly distorted trigonal–planar coordination environment resulting from its coordination by one O atom of the trifluoromethanesulfonate anion and the pyridine N atoms of two crystallographically independent 2′,6′-difluoro-2,3′-bipyridine ligands, which display very similar conformations to one another. Pairwise Ag...O–SO2CF3 − [Ag...O = 2.8314 (14) Å] interactions and intermolecular C—H...O interactions between inversion-related units lead to the formation of an eight-membered cyclic dimer in which the silver atoms are separated by 6.2152 (3) Å. In the crystal, the dimers are linked through C—H...O hydrogen bonds, halogen...π and weak π–π stacking interactions, resulting in the formation of a three-dimensional supramolecular network. The title compound exhibits a strong and broad emission band from 400 nm to 550 nm in solution and its photoluminescence quantum efficiency is estimated to be ca 0.2, indicating that the title compound could have applications as an emitting material in organic light-emitting diodes (OLEDs).

The photophysical properties and electronic structures of bis[1]benzothieno[6,7-d:6′,7′-d′]benzo[1,2-b:4,5-b′]dithiophene (BBTBDT) derivatives as hole-transporting materials for organic light-emitting diodes (OLEDs)

2019 ◽  
Vol 43 (40) ◽  
pp. 15899-15909 ◽  
Author(s):  
Mohamed Bourass ◽  
Najia Komiha ◽  
Oum Keltoum Kabbaj ◽  
Nuha Wazzan ◽  
Mourad Chemek ◽  
...  
Keyword(s):  
Electronic Structures ◽  
Light Emitting Diodes ◽  
Photophysical Properties ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Hole Transporting ◽  
Hole Transporting Materials

The compounds with the D–π–A structure are found to be good candidates for blue-emitting materials.

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