scholarly journals Blue-shifted emission and enhanced quantum efficiency via π-bridge elongation in carbazole–carborane dyads

2016 ◽  
Vol 18 (23) ◽  
pp. 15719-15726 ◽  
Author(s):  
Zhaojin Wang ◽  
Peng Jiang ◽  
Tianyu Wang ◽  
Graeme J. Moxey ◽  
Marie P. Cifuentes ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Quantum Efficiency

Carbazole–carborane linear and V-shaped dyads display unusual blue-shifts in charge-transfer (CT) emission on π-system lengthening; the linear dyads luminesce via a combination of local excited and CT emission, with quantum efficiencies up to 86% in solution.

scholarly journals Enhancing sub-bandgap external quantum efficiency by photomultiplication for narrowband organic near-infrared photodetectors

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jonas Kublitski ◽  
Axel Fischer ◽  
Shen Xing ◽  
Lukasz Baisinger ◽  
Eva Bittrich ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Near Infrared ◽  
Optical Cavity ◽  
Hole Injection ◽  
Visible Range ◽  
Absorption Region ◽  
Electromagnetic Signals ◽  
Organic Photodetectors

AbstractDetection of electromagnetic signals for applications such as health, product quality monitoring or astronomy requires highly responsive and wavelength selective devices. Photomultiplication-type organic photodetectors have been shown to achieve high quantum efficiencies mainly in the visible range. Much less research has been focused on realizing near-infrared narrowband devices. Here, we demonstrate fully vacuum-processed narrow- and broadband photomultiplication-type organic photodetectors. Devices are based on enhanced hole injection leading to a maximum external quantum efficiency of almost 2000% at −10 V for the broadband device. The photomultiplicative effect is also observed in the charge-transfer state absorption region. By making use of an optical cavity device architecture, we enhance the charge-transfer response and demonstrate a wavelength tunable narrowband photomultiplication-type organic photodetector with external quantum efficiencies superior to those of pin-devices. The presented concept can further improve the performance of photodetectors based on the absorption of charge-transfer states, which were so far limited by the low external quantum efficiency provided by these devices.

Quantum efficiency of the photo-induced electronic transfer in dye–TiO2 complexes

2018 ◽  
Vol 20 (41) ◽  
pp. 26280-26287
Author(s):  
Dalma M. Marquez ◽  
Cristián G. Sánchez
Keyword(s):  
Charge Transfer ◽  
Quantum Efficiency ◽  
Electronic Transfer ◽  
Illumination Wavelength

The quantum efficiency of charge transfer in a dye–titania complex is calculated as a function of illumination wavelength.

High-performing D–π–A–π–D benzothiadiazole-based hybrid local and charge-transfer emitters in solution-processed OLEDs

2020 ◽  
Vol 8 (47) ◽  
pp. 17009-17015
Author(s):  
Indu Bala ◽  
Rohit Ashok Kumar Yadav ◽  
Manisha Devi ◽  
Joydip De ◽  
Nitya Singh ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Charge Transfer State ◽  
Solution Processed ◽  
High Performing ◽  
Donor Acceptor ◽  
Transfer State

Benzothiadiazole-based donor–acceptor emitters with hybrid local and charge transfer state exhibit high external quantum efficiency in solution-processed green OLEDs.

Through-Space Charge Transfer Dendrimers Employing Oxygen-Bridged Triarylboron Acceptors for Efficient Deep-Blue Electroluminescence

2021 ◽  
Author(s):  
Baoyun Du ◽  
Xingdong Wang ◽  
Fan Chen ◽  
Qingqing Yang ◽  
Shiyang Shao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Space Charge ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
State Of The Art ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Deep Blue

Though-space charge transfer dendrimers consisting of dendritic triacridan donors and oxygen-bridged triarylboron acceptors are demonstrated to exhibit deep-blue thermally activated delayed fluorescence with state-of-the-art external quantum efficiency of 14.6% for...

scholarly journals Textured nanoporous Mo:BiVO4 photoanodes with high charge transport and charge transfer quantum efficiencies for oxygen evolution

2016 ◽  
Vol 9 (4) ◽  
pp. 1412-1429 ◽  
Author(s):  
Vineet Nair ◽  
Craig L. Perkins ◽  
Qiyin Lin ◽  
Matt Law
Keyword(s):  
Charge Transfer ◽  
Charge Transport ◽  
Oxygen Evolution ◽  
Quantum Efficiency ◽  
Spin Coating ◽  
Transfer Efficiency ◽  
Coating Process ◽  
Spin Coating Process ◽  
High Charge ◽  
Catalyst Free

Nanoporous, catalyst-free BiVO4 films made by a simple spin coating process show a hole-limited charge transport quantum efficiency of ∼70% and >60% charge transfer efficiency for oxidizing water.

scholarly journals Red-shifted delayed fluorescence at the expense of photoluminescence quantum efficiency – an intramolecular charge-transfer molecule based on a benzodithiophene-4,8-dione acceptor

2019 ◽  
Vol 21 (20) ◽  
pp. 10580-10586 ◽  
Author(s):  
Stephanie Montanaro ◽  
Alexander J. Gillett ◽  
Sascha Feldmann ◽  
Emrys W. Evans ◽  
Felix Plasser ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Quantum Efficiency ◽  
Intramolecular Charge Transfer ◽  
Delayed Fluorescence ◽  
Donor Acceptor ◽  
Quinone Acceptor

A donor–acceptor compound using a thiophene based quinone acceptor displays strongly red-shifted delayed emission but limited quantum efficiency.

scholarly journals Quantum Efficiency of Charge Transfer Competing against Nonexponential Processes: The Case of Electron Transfer from CdS Nanorods to Hydrogenase

2018 ◽  
Vol 123 (1) ◽  
pp. 886-896 ◽  
Author(s):  
James K. Utterback ◽  
Molly B. Wilker ◽  
David W. Mulder ◽  
Paul W. King ◽  
Joel D. Eaves ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Quantum Efficiency ◽  
Cds Nanorods

scholarly journals Limitations of Charge Transfer State Parameterization Using Photovoltaic External Quantum Efficiency

2020 ◽  
Vol 10 (41) ◽  
pp. 2001828 ◽  
Author(s):  
Ardalan Armin ◽  
Nasim Zarrabi ◽  
Oskar J. Sandberg ◽  
Christina Kaiser ◽  
Stefan Zeiske ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Charge Transfer State ◽  
Transfer State
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