A novel deep-red-emitting iridium complex with single-peaked narrow emission band: Synthesis, photophysical properties, and electroluminescence performances

2011 ◽  
Vol 131 (2) ◽  
pp. 184-189 ◽  
Author(s):  
Guang Li
Keyword(s):  
Emission Band ◽  
Photophysical Properties ◽  
Iridium Complex ◽  
Narrow Emission

scholarly journals Indenopyrans – synthesis and photoluminescence properties

2016 ◽  
Vol 12 ◽  
pp. 825-834 ◽  
Author(s):  
Andreea Petronela Diac ◽  
Ana-Maria Ţepeş ◽  
Albert Soran ◽  
Ion Grosu ◽  
Anamaria Terec ◽  
...  
Keyword(s):  
Solid State ◽  
Emission Band ◽  
Fluorescence Spectra ◽  
Photophysical Properties ◽  
Quantum Yields ◽  
Band Broadening ◽  
Photoluminescence Properties ◽  
Fluorescence Quantum Yields ◽  
Blue Emitters ◽  
Solid State Fluorescence

New indeno[1,2-c]pyran-3-ones bearing different substituents at the pyran moiety were synthesized and their photophysical properties were investigated. In solution all compounds were found to be blue emitters and the trans isomers exhibited significantly higher fluorescence quantum yields (relative to 9,10-diphenylanthracene) as compared to the corresponding cis isomers. The solid-state fluorescence spectra revealed an important red shift of λmax due to intermolecular interactions in the lattice, along with an emission-band broadening, as compared to the solution fluorescence spectra.

Cationic Iridium Dendrimers: Synthesis and Photophysical Properties

2011 ◽  
Vol 64 (9) ◽  
pp. 1211 ◽  
Author(s):  
Bin Du ◽  
Si-Chun Yuan ◽  
Jian Pei
Keyword(s):  
Solid State ◽  
Photophysical Properties ◽  
Dendritic Structure ◽  
Benzimidazole Derivatives ◽  
Iridium Complex ◽  
Iridium Complexes ◽  
Efficient Energy Transfer ◽  
Ancillary Ligands ◽  
Synthetic Strategy ◽  
Yellow Orange

Two dendrimers, D1 and D2, containing the cationic iridium complexes (C1 and C2) as cores and truxene-functionalized chromophores as the branches, have been developed by a convergent synthetic strategy. The cationic complexes employ 3-(pyridin-2-yl)-1H-1,2,4-triazole and 2-(pyridin-2-yl)-benzimidazole derivatives as the ancillary ligands. To avoid the change in emission colour arising from the iridium complex, the conjugation between the dendron and the ligand is decoupled by separating them using the alkyl chain. An investigation of their photoluminescent features reveals that efficient energy transfer happens from the dendrons to the core in the solid state. Likewise, the charged dendritic structure is demonstrated to be an efficient method to improve the compatibility between the polar charged iridium complexes and typical hydrophobic hosts with the additional benefit of excellent solution processability. Both dendrimers exhibit strong solvatochromic behaviours in solvents and exclusive green and yellow-orange light in the solid state.

scholarly journals Mid-Infrared Spectroscopy of Four 21μm Emission Band Sources

1993 ◽  
Vol 155 ◽  
pp. 341-341
Author(s):  
K. Justtanont ◽  
M. J. Barlow ◽  
C. J. Skinner
Keyword(s):  
Infrared Spectroscopy ◽  
Wavelength Range ◽  
Emission Band ◽  
Emission Feature ◽  
Full Spectrum ◽  
Mid Infrared ◽  
Mid Infrared Spectroscopy ◽  
Long Wavelength ◽  
Spectroscopic Observations ◽  
Narrow Emission

We report 10 and 20μm spectroscopic observations of four C–rich post–AGB objects which exhibit the unidentified emission feature at 21μm. The observations were carried out in October 1990 and May 1991 using CGS3 on UKIRT. The spectral resolutions were 70 for the wavelength range of 7.4–13.3μm and 80 for the region between 15.4–24.1μm. Three of the sources reported here are from the list of Kwok, Volk & Hrivnak (1989), i.e., IRAS 04296+3429; IRAS 07134+1005 and IRAS 22272+5435. Figure 1 shows the full spectrum of IRAS 04296+3429 and IRAS 22272+5435. The 10μm spectra of these objects exhibit UIR bands whose peaks all fall longwards of the usual peak wavelengths associated with such features. This may be related to the fact that they are the lowest excitation objects so far found to exhibit UIR emission bands. We also found narrow emission features superimposed on the long wavelength wing of the 21μm emission bands of IRAS 04296+3429 and IRAS 22272+5435. The fourth object we observed, SAO 163075, was found to also exhibit a (weak) 21μm emission feature. However, there is no PAH features in the 10μm region, apart from the plateau at 12μm.

Multiple Resonance Effect-Induced Sky-Blue Thermally Activated Delayed Fluorescence with a Narrow Emission Band

2019 ◽  
Vol 21 (23) ◽  
pp. 9311-9314 ◽  
Author(s):  
Susumu Oda ◽  
Bungo Kawakami ◽  
Ryosuke Kawasumi ◽  
Ryota Okita ◽  
Takuji Hatakeyama
Keyword(s):  
Emission Band ◽  
Resonance Effect ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Multiple Resonance ◽  
Narrow Emission

Intense Narrow Emission Band from the Surface of Powder of KI: Ag Crystal

1982 ◽  
Vol 51 (10) ◽  
pp. 3079-3080
Author(s):  
Kiichiro Kagawa ◽  
Sadahiro Yokoi ◽  
Masuo Ishikane
Keyword(s):  
Emission Band ◽  
Narrow Emission

scholarly journals ICT and AIE Characteristics Two Cyano-Functionalized Probes and Their Photophysical Properties, DFT Calculations, Cytotoxicity, and Cell Imaging Applications

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 585 ◽  
Author(s):  
Arup Tarai ◽  
Meina Huang ◽  
Pintu Das ◽  
Wenhui Pan ◽  
Jianguo Zhang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Fluorescence Intensity ◽  
Emission Band ◽  
Density Functional ◽  
Cell Imaging ◽  
Photophysical Properties ◽  
High Water ◽  
Aggregation Behavior ◽  
Solvent Mixtures ◽  
Water Fractions

Two probes, AIE-1 and AIE-2, were synthesized to investigate the effect of substitutional functional group on aggregation (aggregation-caused quenching (ACQ) or aggregation-induced emission (AIE)) and intramolecular charge transfer (ICT) behavior as well as on the cell imaging aspect. The yellow-color non-substituted probe AIE-1 showed weak charge-transfer absorption and an emission band at 377 nm and 432 nm, whereas the yellowish-orange color substituted probe AIE-2 showed a strong charge-transfer absorption and an emission band at 424 nm and 477 nm in THF solvent. The UV-Vis studies of AIE-1 and AIE-2 in THF and THF with different water fractions showed huge absorption changes in AIE-2 with high water fractions due to its strong aggregation behavior, but no such noticeable absorption changes were observed for AIE-1. Interestingly, the fluorescence intensity of AIE-1 at 432 nm gradually decreased with increasing water fractions and became almost non-emissive at 90% water. However, the monomer-type emission of AIE-2 at 477 nm was shifted to 584 nm with a 6-fold increase in fluorescence intensity in THF-H2O (1:9, v/v) solvent mixtures due to the restriction of intramolecular rotation on aggregation in high water fractions. This result indicates that the probe AIE-1 shows ACQ and probe AIE-2 shows AIE behaviors in THF-H2O solvent mixtures. Furthermore, the emission spectra of AIE-1 and AIE-2 were carried out in different solvent and with different concentrations to see the solvent- or concentration-dependent aggregation behavior. Scanning electron microscope (SEM) and dynamic light scattering (DLS) experiments were also conducted to assess the morphology and particle size of two probes before and after aggregation. Both of the probes, AIE-1 and AIE-2, showed less toxicity on HeLa cells and were suitable for cell imaging studies. Density functional theory (DFT) calculation was also carried out to confirm the ICT process from an electron-rich indole moiety to an electron-deficient cyano-phenyl ring of AIE-1 or AIE-2.

NOVEL BLUE ORGANIC LIGHT-EMITTING MATERIAL

2004 ◽  
Vol 13 (03n04) ◽  
pp. 649-653 ◽  
Author(s):  
YUN-HI KIM ◽  
HYUNG-SUN KIM ◽  
JUN-HWAN AHN ◽  
SUNG-HAN KIM ◽  
SOON-KI KWON
Keyword(s):  
Emission Band ◽  
Blue Emission ◽  
Luminous Efficiency ◽  
Full Width ◽  
Half Maximum ◽  
Device Structure ◽  
Light Emitting ◽  
Organic Light ◽  
Chromaticity Coordinates ◽  
Narrow Emission

The blue light-emitting material was synthesized. With the non-doped, blue-emitting material in the multilayer device structure, it was possible to achieve the luminous efficiency of 3.38 cd/A at 110 mA/cm2. The EL spectrum of the ITO / CuPc / NPB / BDPSP / Alq 3/ Mg : Ag device showed a narrow emission band with full width at half maximum (FWHM) 70 nm and λ max =448.25 nm . The emitting color of the device showed the highly pure blue emission (x,y)=(0.158, 0.10) for ITO / CuPc / NPB / BDPSP / Alq 3/ Mg : Ag in CIE (Commission Internationale de l'Eclairage) chromaticity coordinates.

A green emitting iridium(III) complex with narrow emission band and its application to phosphorescence organic light-emitting diodes (OLEDs)

2009 ◽  
Vol 10 (6) ◽  
pp. 1066-1073 ◽  
Author(s):  
Sung Ouk Jung ◽  
Qinghua Zhao ◽  
Jong-Won Park ◽  
Seul Ong Kim ◽  
Yun-Hi Kim ◽  
...  
Keyword(s):  
Emission Band ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Narrow Emission

Asymmetric Blue Multiresonance TADF Emitters with a Narrow Emission Band

2021 ◽  
Author(s):  
Jinho Park ◽  
Junseop Lim ◽  
Jin Ho Lee ◽  
Beomsu Jang ◽  
Ju Hee Han ◽  
...  
Keyword(s):  
Emission Band ◽  
Narrow Emission

Linearly polarized electroluminescence from ionic iridium complex-based metallomesogens: the effect of aliphatic-chain on their photophysical properties

2018 ◽  
Vol 6 (13) ◽  
pp. 3298-3309 ◽  
Author(s):  
Xiugang Wu ◽  
Guohua Xie ◽  
Christopher P. Cabry ◽  
Xiaoyu Xu ◽  
Stephen J. Cowling ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Iridium Complex ◽  
Aliphatic Chain ◽  
Linearly Polarized

Clearly polarized electroluminescence was obtained from ionic iridium complex-based metallomesogens.

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