Quinoline-annulated porphyrin platinum complexes as NIR emitters

2020 ◽  
Vol 24 (01n03) ◽  
pp. 386-393 ◽  
Author(s):  
Joshua Akhigbe ◽  
Michael Luciano ◽  
Adewole O. Atoyebi ◽  
Steffen Jockusch ◽  
Christian Brückner
Keyword(s):  
Optical Properties ◽  
Emission Spectra ◽  
Platinum Complexes ◽  
Optical Spectra ◽  
Biological Media ◽  
Optical Window ◽  
Emission Yield ◽  
Phosphorescence Spectra

The platinum(II) complexes of known quinoline-annulated porphyrins were prepared and spectroscopically characterized. Their optical properties (UV-vis absorption and phosphorescence spectra and phosphorescence lifetimes) were recorded and contrasted against their 2,3-dioxoporphyrin precursor platinum(II) complex. The absorbance and emission spectra (in EtOH glass at 77 K) of the quinoline-annulated porphyrins fall within the NIR optical window of tissue, ranging, depending on the derivative, between [Formula: see text]950 and 1200 nm. The much red-shifted optical spectra, when compared to their non-quinoline-annulated precursors, are attributed to the [Formula: see text]-extension and conformational non-planarity that the annulation causes. The emission yields of the mono-quinoline-annulated derivatives are too low and their lifetimes too short to be practical emitters, but the bis-annulated derivative possesses a practical lifetime and emission yield, suggesting its further exploration, particularly since the methodology toward the solubilization of the quinoline-annulated porphyrins in biological media through derivatization is known.

Photonic Crystals Based on Two-Layer Opaline Heterostructures

2002 ◽  
Vol 722 ◽  
Author(s):  
S. G. Romanov ◽  
T. Maka ◽  
V. G. Solovyev ◽  
P. Ferrand ◽  
C. M. Sotomayor Torres ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photonic Crystals ◽  
Emission Spectra ◽  
Optical Spectra ◽  
Degree Of Order ◽  
Interface Disorder

AbstractOptical properties of several heterostructures representing two-layer opaline photonic crystals have been examined. Two separate stop-bands have been observed both in transmission and emission spectra. The effect of the interface disorder on the optical spectra was not observed, probably, due to the insufficient degree of order of the opaline layers.

scholarly journals An excursion in the second-order nonlinear optical properties of platinum complexes

2021 ◽  
Vol 446 ◽  
pp. 214113
Author(s):  
Alessia Colombo ◽  
Claudia Dragonetti ◽  
Véronique Guerchais ◽  
Dominique Roberto
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Platinum Complexes ◽  
Second Order ◽  
Nonlinear Optical Properties

Enhancement of optical properties of poly (9,9′-di-n-octylfluorenyl-2,7-diyl) in conjugated polymer/TiO2 nanocomposites

2014 ◽  
Vol 92 (9) ◽  
pp. 1021-1025 ◽  
Author(s):  
Bandar Ali Al-Asbahi ◽  
Mohammad Hafizuddin Haji Jumali
Keyword(s):  
Optical Properties ◽  
Conjugated Polymer ◽  
Emission Spectra ◽  
Treatment Temperature ◽  
Nanocomposite Films ◽  
Glass Substrates ◽  
Solution Blending ◽  
Heat Treated ◽  
Blending Method ◽  
Splitting Energy

The influence of colloidal TiO2 nanoparticle contents on the optical properties of poly (9,9′-di-n-octylfluorenyl-2,7-diyl) conjugated polymer (PFO) has been investigated. The solution blending method was used to prepare homogenous PFO/TiO2 nanocomposite. The nanocomposite films were prepared on glass substrates using the spin-coating technique. The films were divided into two groups, the first was left to dry at room temperature while the second was heat-treated at 120 °C for 1 h. Absorption and emission spectra showed that the PFO existed in α- and β-phases morphology having monomeric, excimeric, and double excimeric states. In addition, both spectra revealed that TiO2 contents and heat treatment temperature extended the conjugation length of PFO. Finally, emission spectra for both cases exhibited decreasing in the line width of zero-phonon emission spectra and increasing in the vibronic splitting energy, upon increment of the TiO2, led to a significant increase in π-electron delocalization and lower degree in chain disorder.

Effect of UV Treatment on Optical Properties of Low-Density Polyethylene Films Doped with Eu(TTA)3phen Complex

2014 ◽  
Vol 895 ◽  
pp. 155-161
Author(s):  
M.I. Khairuldin ◽  
N.M.A. Aziz ◽  
N.M. Nashaain ◽  
S. Wedianti ◽  
I. Farehah ◽  
...  
Keyword(s):  
Optical Properties ◽  
Emission Spectra ◽  
Low Density Polyethylene ◽  
Rare Earth Complex ◽  
Low Density ◽  
Uv Treatment ◽  
Uv Spectrum ◽  
Light Manipulation ◽  
Emission Transition ◽  
Ft Ir

Low-Density Polyethylene (LDPE) films doped with Eu (TTA)3phen complex (TTA=2-thenoyltrifluoroacetone, phen=1,10-phenanthroline) were fabricated by hot-blowing technique for thickness of 100 μm. The films were doped with 0.1 % of Eu (TTA)3phen to the total weight of LDPE and exposed to UV irradiation from deuterium lamp for 5, 10, 20, 40 and 60 hours to investigate the effect of its optical properties. The films were characterized by Spectrofluorometer, UV/VIS Spectrophotometer and FT-IR Spectrometer to measure their emission spectra, lifetimes, transmission transparency and chemical bonding. Photoluminescence of the room-temperature Eu (TTA)3phen doped films consist of typical Eu3+emission transition lines with hypersensitive5D07F2emission band at 610 nm. After 20 hours UV treatment, the peak intensity dropped by 90 % and shortened the luminescent lifetimes from 0.654 ms to 0.305 ms. Longer UV treatment also has accelerated degradation in doped LDPE films shown by significant reducing in absorption peak of FTIR at 3395, 3186 and 1645 cm-1. The results would provide a mechanism to improve the lifetime of the LDPE by utilizing the light-manipulation property of Eu (TTA)3phen complex to absorb UV spectrum and covert into red emission.Keywords: LDPE, rare-earth complex, photoluminescence

Observation of Internal Interference in Emission Spectra of GaAs0.9P0.1LED's with Thin N-Layer as an Optical Window

1977 ◽  
Vol 16 (11) ◽  
pp. 2069-2070 ◽  
Author(s):  
Noriyuki Shimano ◽  
Ryozoh Furukawa ◽  
Yasuo Morimoto
Keyword(s):  
Emission Spectra ◽  
Optical Window

scholarly journals Synthesis and optical properties of new 5'-aryl-substituted 2,5-bis(3-decyl-2,2'-bithiophen-5-yl)-1,3,4-oxadiazoles

2017 ◽  
Vol 13 ◽  
pp. 313-322 ◽  
Author(s):  
Anastasia Sergeevna Kostyuchenko ◽  
Tatyana Yu Zheleznova ◽  
Anton Jaroslavovich Stasyuk ◽  
Aleksandra Kurowska ◽  
Wojciech Domagala ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Chemical ◽  
Emission Spectra ◽  
Aryl Halides ◽  
Aryl Substituent ◽  
Tddft Calculations ◽  
Terminal Substituent ◽  
Bluish Green ◽  
Palladium Catalyzed ◽  
Donor Acceptor

New photoluminescent donor–acceptor–donor (DAD) molecules, namely 5'-aryl-substituted 2,5-bis(3-decyl-2,2'-bithiophen-5-yl)-1,3,4-oxadiazoles were prepared by palladium-catalyzed coupling from readily available compounds such as ethyl 3-decyl-2,2'-bithiophene-5-carboxylate and aryl halides. The obtained compounds feature increasing bathochromic shifts in their emission spectra with increasing aryl-substituent size yielding blue to bluish-green emissions. At the same time, their absorption spectra are almost independent from the identity of the terminal substituent with λmax values ranging from 395 to 405 nm. The observed trends are perfectly predicted by quantum chemical DFT/TDDFT calculations carried out for these new molecules.

scholarly journals Novel cyclometallated 5-π-delocalized donor-1,3-di(2-pyridyl)benzene platinum(ii) complexes with good second-order nonlinear optical properties

2019 ◽  
Vol 48 (1) ◽  
pp. 202-208 ◽  
Author(s):  
Mattia Fontani ◽  
Eleonora Garoni ◽  
Alessia Colombo ◽  
Claudia Dragonetti ◽  
Simona Fantacci ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Platinum Complexes ◽  
Second Order ◽  
Nonlinear Optical Properties

For platinum complexes bearing a cyclometallated 5-thiophene-1,3-di(2-pyridyl)benzene, βEFISH increases following the order of the LUMO stabilization.

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