Modulating the Optoelectronic Properties of Large, Conjugated, High-Energy Gap, Quaternary Phosphine Oxide Hosts: Impact of the Triplet-Excited-State Location

2013 ◽  
Vol 19 (29) ◽  
pp. 9549-9561 ◽  
Author(s):  
Zhen Zhang ◽  
Zhensong Zhang ◽  
Runfeng Chen ◽  
Jilin Jia ◽  
Chunmiao Han ◽  
...  
Keyword(s):  
Excited State ◽  
Phosphine Oxide ◽  
Energy Gap ◽  
High Energy ◽  
Optoelectronic Properties ◽  
Triplet Excited State

scholarly journals Correction: Ternary donor–acceptor phosphine oxide hosts with peculiar high energy gap for efficient blue electroluminescence

2015 ◽  
Vol 3 (36) ◽  
pp. 9479-9479 ◽  
Author(s):  
Mingzhi Sun ◽  
Liping Zhu ◽  
Wenjing Kan ◽  
Ying Wei ◽  
Dongge Ma ◽  
...  
Keyword(s):  
Phosphine Oxide ◽  
Energy Gap ◽  
High Energy ◽  
Donor Acceptor

Correction for ‘Ternary donor–acceptor phosphine oxide hosts with peculiar high energy gap for efficient blue electroluminescence’ by Mingzhi Sun et al., J. Mater. Chem. C, 2015, DOI: 10.1039/c5tc02029h.

Ternary donor–acceptor phosphine oxide hosts with peculiar high energy gap for efficient blue electroluminescence

2015 ◽  
Vol 3 (36) ◽  
pp. 9469-9478 ◽  
Author(s):  
Mingzhi Sun ◽  
Liping Zhu ◽  
Wenjing Kan ◽  
Ying Wei ◽  
Dongge Ma ◽  
...  
Keyword(s):  
Phosphine Oxide ◽  
Energy Gap ◽  
High Energy ◽  
Electronic Coupling ◽  
Triplet Energy ◽  
Donor Acceptor

A triangle-shaped D–A–A molecule PCImbPO with unusually high triplet energy of 3.0 eV, enhanced D–A electronic coupling and separated FMO and triplet locations is described.

scholarly journals Tuning the singlet-triplet energy gap: a unique approach to efficient photosensitizers with aggregation-induced emission (AIE) characteristics

2015 ◽  
Vol 6 (10) ◽  
pp. 5824-5830 ◽  
Author(s):  
Shidang Xu ◽  
Youyong Yuan ◽  
Xiaolei Cai ◽  
Chong-Jing Zhang ◽  
Fang Hu ◽  
...  
Keyword(s):  
Excited State ◽  
Excited States ◽  
Energy Gap ◽  
Intersystem Crossing ◽  
Triplet Excited State ◽  
Triplet Energy ◽  
Aggregation Induced Emission ◽  
Unique Approach ◽  
Triplet Excited States

The efficiency of the intersystem crossing process can be improved by reducing the energy gap between the singlet and triplet excited states (ΔEST), which offers the opportunity to improve the yield of the triplet excited state.

scholarly journals Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Zesen Lin ◽  
Ryota Kabe ◽  
Kai Wang ◽  
Chihaya Adachi
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Excited States ◽  
Energy Gap ◽  
Persistent Luminescence ◽  
Triplet Excited State ◽  
Exciton Energy ◽  
Selection Strategies ◽  
Molecular Selection ◽  
Spectra Properties

AbstractOrganic long-persistent luminescence (LPL) is an organic luminescence system that slowly releases stored exciton energy as light. Organic LPL materials have several advantages over inorganic LPL materials in terms of functionality, flexibility, transparency, and solution-processability. However, the molecular selection strategies for the organic LPL system still remain unclear. Here we report that the energy gap between the lowest localized triplet excited state and the lowest singlet charge-transfer excited state in the exciplex system significantly controls the LPL performance. Changes in the LPL duration and spectra properties are systematically investigated for three donor materials having a different energy gap. When the energy level of the lowest localized triplet excited state is much lower than that of the charge-transfer excited state, the system exhibits a short LPL duration and clear two distinct emission features originating from exciplex fluorescence and donor phosphorescence.

A p–n fusion strategy to design bipolar organic materials for high-energy-density symmetric batteries

2021 ◽  
Author(s):  
Jihyeon Kim ◽  
Heechan Kim ◽  
Sechan Lee ◽  
Giyun Kwon ◽  
Taewon Kang ◽  
...  
Keyword(s):  
Energy Density ◽  
Organic Material ◽  
Energy Gap ◽  
High Energy ◽  
High Energy Density ◽  
Lumo Energy ◽  
Fusion Strategy ◽  
Redox Active ◽  
Bipolar Type ◽  
Homo Lumo

A new bipolar-type redox-active organic material with a wide HOMO–LUMO energy gap is designed though the ‘p–n fusion’ strategy.

scholarly journals Ultra long‐lived triplet excited state in water at room temperature: Insights on the molecular design of tridecafullerenes

2021 ◽  
Author(s):  
Javier Ramos-Soriano ◽  
Alfonso Pérez-Sánchez ◽  
Sergio Ramírez-Barroso ◽  
Beatriz M. Illescas ◽  
Khalid Azmani ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Molecular Design ◽  
Triplet Excited State

scholarly journals Triplet energies and excimer formation in meta - and para -linked carbazolebiphenyl matrix materials

2015 ◽  
Vol 373 (2044) ◽  
pp. 20140446 ◽  
Author(s):  
Sergey A. Bagnich ◽  
Alexander Rudnick ◽  
Pamela Schroegel ◽  
Peter Strohriegl ◽  
Anna Köhler
Keyword(s):  
Excited State ◽  
Triplet State ◽  
Spectroscopic Investigation ◽  
Triplet Excited State ◽  
Conjugation Length ◽  
Triplet Energy ◽  
Excimer Formation

We present a spectroscopic investigation on the effect of changing the position where carbazole is attached to biphenyl in carbazolebiphenyl (CBP) on the triplet state energies and the propensity to excimer formation. For this, two CBP derivatives have been prepared with the carbazole moieties attached at the ( para ) 4- and 4 ′ -positions ( p CBP) and at the ( meta ) 3- and 3 ′ -positions ( m CBP) of the biphenyls. These compounds are compared to analogous m CDBP and p CDBP, i.e. two highly twisted carbazoledimethylbiphenyls, which have a high triplet energy at about 3.0 eV and tend to form triplet excimers in a neat film. This torsion in the structure is associated with localization of the excited state onto the carbazole moieties. We find that in m CBP and p CBP, excimer formation is prevented by localization of the triplet excited state onto the central moiety. As conjugation can continue from the central biphenyls into the nitrogen of the carbazole in the para -connected p CBP, emission involves mainly the benzidine. By contrast, the meta -linkage in m CBP limits conjugation to the central biphenyl. The associated shorter conjugation length is the reason for the higher triplet energy of 2.8 eV in m CBP compared with the 2.65 eV in p CBP.

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