Thienyl-substituted BODIPYs with strong visible light-absorption and long-lived triplet excited states as organic triplet sensitizers for triplet–triplet annihilation upconversion

RSC Advances ◽  
2012 ◽  
Vol 2 (9) ◽  
pp. 3942 ◽  
Author(s):  
Yinghui Chen ◽  
Jianzhang Zhao ◽  
Lijuan Xie ◽  
Huimin Guo ◽  
Qiuting Li
Keyword(s):  
Visible Light ◽  
Excited States ◽  
Light Absorption ◽  
Visible Light Absorption ◽  
Triplet Excited States ◽  
Triplet Triplet Annihilation

trans-Bis(alkylphosphine) platinum(ii)-alkynyl complexes showing broadband visible light absorption and long-lived triplet excited states

2014 ◽  
Vol 2 (45) ◽  
pp. 9720-9736 ◽  
Author(s):  
Huiru Jia ◽  
Betül Küçüköz ◽  
Yongheng Xing ◽  
Poulomi Majumdar ◽  
Caishun Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Visible Light ◽  
Excited States ◽  
Light Absorption ◽  
Light Harvesting ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Visible Light Absorption ◽  
Triplet Excited States

Broadband visible light-harvesting bis(alkylphosphine) platinum(ii)-alkynyl complexes based on resonance energy transfer were prepared and used for TTA upconversion.

Visible Light Absorption and Long-Lived Excited States in Dinuclear Silver(I) Complexes with Redox-Active Ligands

2020 ◽  
Vol 59 (24) ◽  
pp. 18338-18344
Author(s):  
Dylan J. Shields ◽  
Tasneem Elkoush ◽  
Emily Miura-Stempel ◽  
Choi L. Mak ◽  
Guang-Hao Niu ◽  
...  
Keyword(s):  
Visible Light ◽  
Excited States ◽  
Light Absorption ◽  
Redox Active Ligands ◽  
Visible Light Absorption ◽  
Redox Active

scholarly journals Enhancing the Visible-Light Absorption and Excited-State Properties of Cu(I) MLCT Excited States

2018 ◽  
Vol 57 (4) ◽  
pp. 2296-2307 ◽  
Author(s):  
Sofia Garakyaraghi ◽  
Catherine E. McCusker ◽  
Saba Khan ◽  
Petr Koutnik ◽  
Anh Thy Bui ◽  
...  
Keyword(s):  
Excited State ◽  
Visible Light ◽  
Excited States ◽  
Light Absorption ◽  
Visible Light Absorption

Impact of Rutile Fraction on TiO2 Visible-Light Absorption and Visible-Light-Induced Photocatalytic Activity

2018 ◽  
Author(s):  
David Maria Tobaldi ◽  
Luc Lajaunie ◽  
ana caetano ◽  
nejc rozman ◽  
Maria Paula Seabra ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Solid Phase ◽  
Diffraction Method ◽  
Band Alignment ◽  
Quantitative Phase Analysis ◽  
Transmission Microscopy ◽  
Visible Light Absorption ◽  
X Ray

<div>Titanium dioxide is by far the most utilised semiconductor material for photocatalytic applications. Still, it is transparent to visible-light. Recently, it has been proved that a type-II band alignment for the rutile−anatase mixture would improve its visible-light absorption.</div><div>In this research paper we thoroughly characterised the real crystalline and amorphous phases of synthesised titanias – thermally treated at different temperatures to get distinct ratios of anatase-rutile-amorphous fraction – as well as that of three commercially available photocatalytic nano-TiO2. </div><div>The structural characterisation was done via advanced X-ray diffraction method, namely the Rietveld-RIR method, to attain a full quantitative phase analysis of the specimens. The microstructure was also investigated via an advanced X-ray method, the whole powder pattern modelling. These methods were validated combining advanced aberration-corrected scanning transmission microscopy and high-resolution electron energy-loss spectroscopy. The photocatalytic activity was assessed in the liquid- and gas-solid phase (employing rhodamine B and 4-chlorophenol, and isopropanol, respectively, as the organic substances to degrade) using a light source irradiating exclusively in the visible-range.</div><div>Optical spectroscopy showed that even a small fraction of rutile (2 wt%) is able to shift to lower energies the apparent optical band gap of an anatase-rutile mixed phase. But is this enough to attain a real photocatalytic activity promoted by merely visible-light?</div><div>We tried to give a reply to that question.</div><div>Photocatalytic activity results in the liquid-solid phase showed that a high surface hydroxylation led to specimen with superior visible light-induced catalytic activity (i.e. dye and ligand-to-metal charge transfer complexes sensitisation effects). That is: not photocatalysis <i>sensu-strictu</i>.</div><div>On the other hand, the gas-solid phase results showed that a higher amount of the rutile fraction (around 10 wt%), together with less recombination of the charge carriers, were more effective for an actual photocatalytic oxidation of isopropanol.</div>

Sign in / Sign up

Export Citation Format

Share Document