Results 41 to 50 of about 299,211 (194)

Unveiling the concentration dependent direct triplet formation via singlet fission in a tetracene derivative [PDF]

EPJ Web of Conferences, 2019
Singlet fission is slowed down on diffusional timescales in highly concentrated solutions compared to thin films for a tetracene-like molecule. The underlying mechanism suggests competing intersystem crossing and singlet fission, where in the latter ...
Wollscheid Nikolaus, Alagna Nicolo, Perez Lustres J. Luis, Buckup Tiago, Hahn Sebastian, Bunz Uwe H. F., Motzkus Marcus   +6 more
doaj   +1 more source

High efficient room temperature phosphorescent materials constructed with methylene molecular configuration

Frontiers in Chemistry, 2022
In this work, we have investigated several pure organic room temperature phosphorescent materials with donor-methylene acceptor configurations with relatively different quantum efficiency.
Jian Wang
doaj   +1 more source

Effect of temperature on rate of the spin-forbidden transition in uracil and thymine [PDF]

Journal of the Serbian Chemical Society, 2013
The intersystem crossing rates of uracil and thymine molecules in interaction with the heat bath were studied by means of the ab initio methods. The rates were calculated employing the time-dependent approach based on the correlation function.
Etinski Mihajlo
doaj   +1 more source

Mechanism of the Zn(II)Phthalocyanines’ Photochemical Reactions Depending on the Number of Substituents and Geometry

Molecules, 2016
In this work, the synthesis and the nonlinear absorption and population dynamics investigation of a series of zinc phthalocyanines (ZnPcs) dissolved in chloroform are reported.
Leandro Henrique Zucolotto Cocca, Mehmet Menaf Ayhan, Ayşe Gül Gürek, Vefa Ahsen, Yann Bretonnière, Jonathas de Paula Siqueira, Fernando Gotardo, Cleber Renato Mendonça, Catherine Hirel, Leonardo De Boni   +9 more
doaj   +1 more source

Ultralong phosphorescence cellulose with excellent anti-bacterial, water-resistant and ease-to-process performance

Nature Communications, 2022
Organic room-temperature phosphorescence (RTP) materials often suffer from poor processability because of their crystalline or cross-linked nature.
Xin Zhang, Yaohui Cheng, Jingxuan You, Jinming Zhang, Chunchun Yin, Jun Zhang   +5 more
doaj   +1 more source

Intersystem crossing in the entrance channel of the reaction of O(3P) with pyridine [PDF]

, 2022
Two quantum effects can enable reactions to take place at energies below the barrier separating reactants from products: tunnelling and intersystem crossing between coupled potential energy surfaces.
Alessandrini, Silvia, Murray, Vanessa J, Casavecchia, Piergiorgio, Puzzarini, Cristina, Recio, Pedro, Caracciolo, Adriana, Pannacci, Giacomo, Marchione, Demian, Balucani, Nadia, Barone, Vincenzo, Baggioli, Alberto, Cavallotti, Carlo, Vanuzzo, Gianmarco   +12 more
core   +1 more source

Internal Conversion vs. Intersystem Crossing – What Drives the Dynamics of Cyclic α,β-Enones?

EPJ Web of Conferences, 2013
The origin of ultrafast intersystem crossing and its competitiveness with singlet pathways was studied in cyclic α,β-enones by transient absorption, time-resolved photoelectron spectroscopy and ab initio calculations.
Riedle E., Bradler M., Wu G., Schuurman M. S., Lang P., Schalk O., Stolow A.   +6 more
doaj   +1 more source

Intersystem Crossing Processes of Acridine [PDF]

Bulletin of the Chemical Society of Japan, 1977
Abstract The T1(π, π*)→T3(π, π*) absorption of acridine has first been observed at about 985 nm in ethanol. Temperature dependences of the fluorescence lifetime and the triplet yield of acridine were investigated in poly(vinyl alcohol) film, and it was found that the intersystem crossing from the first excited singlet state S1(π, π*) to ...
Koichi Kikuchi, Koji Uji-ie, Yoshikatsu Miyashita, Hiroshi Kokubun   +3 more
openaire   +1 more source

Singlet Fission, Polaron Generation and Intersystem Crossing in Hexaphenyl Film

Molecules, 2022
The ultrafast dynamics of triplet excitons and polarons in hexaphenyl film was investigated by time-resolved fluorescence and femtosecond transient absorption techniques under various excitation photon energies. Two distinct pathways of triplet formation
Wenjun Ni, Tianjiao Li, Christian Kloc, Licheng Sun, Gagik G. Gurzadyan   +4 more
doaj   +1 more source

Confining donor conformation distributions for efficient thermally activated delayed fluorescence with fast spin-flipping

Nature Communications, 2023
Fast spin-flipping is the key to exploit the triplet excitons in thermally activated delayed fluorescence based organic light-emitting diodes toward high efficiency, low efficiency roll-off and long operating lifetime.
Weidong Qiu, Denghui Liu, Mengke Li, Xinyi Cai, Zijian Chen, Yanmei He, Baoyan Liang, Xiaomei Peng, Zhenyang Qiao, Jiting Chen, Wei Li, Junrong Pu, Wentao Xie, Zhiheng Wang, Deli Li, Yiyang Gan, Yihang Jiao, Qing Gu, Shi-Jian Su   +18 more
doaj   +1 more source