Texaphyrin sensitized near-IR-to-visible photon upconversion

2014 ◽  
Vol 13 (5) ◽  
pp. 813-819 ◽  
Author(s):  
Fan Deng ◽  
Wenfang Sun ◽  
Felix N. Castellano
Keyword(s):  
Yellow Fluorescence ◽  
Near Ir ◽  
Nir Absorption ◽  
Visible Photon ◽  
Triplet Triplet Annihilation

Near-IR (NIR) absorption from a Cd(ii) texaphyrin (TXP) has been successfully coupled with rubrene triplet acceptors/annihilators in vacuum degassed dichloromethane to upconvert NIR (670–800 nm) incident photons into yellow fluorescence through sensitized triplet–triplet annihilation.

Highly Photostable Near-IR-Excitation Upconversion Nanocapsules Based on Triplet–Triplet Annihilation for in Vivo Bioimaging Application

2018 ◽  
Vol 10 (12) ◽  
pp. 9883-9888 ◽  
Author(s):  
Qian Liu ◽  
Ming Xu ◽  
Tianshe Yang ◽  
Bo Tian ◽  
Xinglin Zhang ◽  
...  
Keyword(s):  
Near Ir ◽  
Triplet Triplet Annihilation

A near-infrared benzoquinone-coupled BODIPY: Synthesis, spectroscopic and electrochemical properties

2019 ◽  
Vol 23 (01n02) ◽  
pp. 76-83
Author(s):  
Hu Gao ◽  
Hui Liu ◽  
Liang Jiang ◽  
Lizhi Gai ◽  
Zhen Shen
Keyword(s):  
Near Infrared ◽  
Energy Gap ◽  
Bathochromic Shift ◽  
Crystallographic Analysis ◽  
Oxidation Potential ◽  
Redox Potentials ◽  
Lumo Energy ◽  
Tert Butyl ◽  
Near Ir ◽  
Nir Absorption

A near-infrared absorbing boron-dipyrromethene (BODIPY) chromophore coupled with two benzoquinone moieties at its 3,5-positions, 3, was prepared via Knoevenagel condensation of 1,3,5,7-tetramethyl-8-(4[Formula: see text]-benzonitrile) BODIPY 1 with 3,5-di-tert-butyl-4-hydroxybenzaldehyde to afford 1,7-dimethyl-3,5-di-(4[Formula: see text]-hydroxy-3[Formula: see text],5[Formula: see text]-di-tert-butyl styryl)-8-(4[Formula: see text]-benzonitrile) BODIPY 2, followed by oxidization with Ag2O in good yield (91%). The UV-vis-NIR absorption spectrum of 3 exhibits two major bands at 795 and 895 nm in the near-IR region, while 2shows maximum absorbance at 661 nm and strong fluorescence at 692 nm ([Formula: see text] 0.59). The cyclic voltammetry of 3 consists of two pairs of reversible one-electron reductions at -0.61 V and -0.88 V and two pairs of one-electron oxidation waves at 0.26 V and 0.54 V. Compared with the redox potentials of 2([Formula: see text] V and [Formula: see text] 0.25 V), the first reduction of 3 is anodically shifted for 710 mV, whereas the first oxidation potential is close. Theoretical calculation reveals that conjugation with the benzoquinone moieties on the BODIPY chromophore significantly lowers the LUMO energy level and the HOMO–LUMO energy gap, resulting in a dramatic bathochromic shift of the S0–S1 transition of 3 compared with that of 2. X-ray crystallographic analysis of 3 reveals that the whole molecule adopts a V-type twisted conformation along the delocalized [Formula: see text]-conjugated pathway.

Synthesis and photophysical properties of orthogonal rhodium(iii)–carbon bonded porphyrin–aza-BODIPY conjugates

2016 ◽  
Vol 4 (36) ◽  
pp. 8422-8428 ◽  
Author(s):  
Jinfeng Zhou ◽  
Lizhi Gai ◽  
John Mack ◽  
Zhikuan Zhou ◽  
Hailin Qiu ◽  
...  
Keyword(s):  
Triplet State ◽  
Photophysical Properties ◽  
Facile Synthesis ◽  
Near Ir ◽  
Nir Absorption ◽  
Rhodium Porphyrins

The facile synthesis of novel orthogonally arranged Rh(iii) porphyrin–aza-BODIPY conjugates is described. The conjugates combine the advantages of the near-IR (NIR) absorption of aza-BODPY dye with the high triplet state of rhodium porphyrins.

scholarly journals Influence of L-threonine on the growth, structural, optical, mechanical and nonlinear optical properties of tartaric acid single crystal

2018 ◽  
Vol 36 (4) ◽  
pp. 630-637
Author(s):  
G. Thilakavathi ◽  
R. Arun Kumar ◽  
V. Gunasekaran
Keyword(s):  
Tartaric Acid ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
X Ray Diffraction ◽  
Etch Patterns ◽  
Near Ir ◽  
Nir Absorption ◽  
Nlo Materials ◽  
Ft Ir ◽  
Crystalline Nature

AbstractSingle crystals of pure and L-threonine added tartaric acid (LT/TA), organic nonlinear optical (NLO) materials were grown from their respective aqueous solution by slow evaporation method. The crystalline nature of the grown crystals was confirmed by powder X-ray diffraction analysis (XRD). UV-Vis-NIR absorption and transmission spectra revealed that the lower cut-off wavelength was around 281 nm and the crystals exhibited high transmission over visible and near IR region. The presence of the functional groups such as O–H, C–H, C–O, C=O in the grown crystals was confirmed by FT-IR analysis. CHN analysis was carried out to confirm the presence of L-threonine in the grown crystals. Microhardness study on the crystals revealed that the hardness number Hv increased with the applied load. The growth pattern of the crystals were analyzed through etching analysis from which the etch patterns in the shape of ‘step-triangle’ were observed. The second harmonic generation (SHG) properties of pure and L-threonine doped tartaric acid crystals were confirmed by Kurtz-Perry powder technique.

Solid-State, Near-Infrared to Visible Photon Upconversion via Triplet–Triplet Annihilation of a Binary System Fabricated by Solution Casting

2019 ◽  
Vol 11 (23) ◽  
pp. 20812-20819 ◽  
Author(s):  
Aizitiaili Abulikemu ◽  
Yusuke Sakagami ◽  
Claire Heck ◽  
Kenji Kamada ◽  
Hikaru Sotome ◽  
...  
Keyword(s):  
Solid State ◽  
Binary System ◽  
Near Infrared ◽  
Solution Casting ◽  
Visible Photon ◽  
Triplet Triplet Annihilation

Cyclometalated Ir(iii) complexes with styryl-BODIPY ligands showing near IR absorption/emission: preparation, study of photophysical properties and application as photodynamic/luminescence imaging materials

2014 ◽  
Vol 2 (19) ◽  
pp. 2838-2854 ◽  
Author(s):  
Poulomi Majumdar ◽  
Xiaolin Yuan ◽  
Shengfu Li ◽  
Boris Le Guennic ◽  
Jie Ma ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Ir Absorption ◽  
Luminescence Imaging ◽  
Near Ir ◽  
Nir Absorption

Heteroleptic C^N cyclometalated iridium(iii) complexes showing strong NIR absorption were prepared.

Surface Brightness Scale of Galactic Cepheids

1999 ◽  
Vol 190 ◽  
pp. 561-562
Author(s):  
G. P. Di Benedetto
Keyword(s):  
Surface Brightness ◽  
Variable Stars ◽  
Giant Stars ◽  
Near Ir

An accurate calibration of the surface brightness scaleSVas a function of the near-IR color (V–K) has been recently measured for non-variable Galactic dwarf and giant stars. It can be shown that this correlation can be applied to theSVscale of Galactic Cepheid variable stars, which are of major cosmological interest.

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