Control of the Singlet–Triplet Energy Gap in a Thermally Activated Delayed Fluorescence Emitter by Using a Polar Host Matrix

Autor:	Shota Haseyama, Akitsugu Niwa, Takashi Kobayashi, Takashi Nagase, Kenichi Goushi, Chihaya Adachi, Hiroyoshi Naito
Jazyk:	angličtina
Rok vydání:	2017
Předmět:	Thermally activated delayed fluorescence (TADF) Photoluminescence spectroscopy Electronic permittivity Polar host matrix Materials of engineering and construction. Mechanics of materials TA401-492
Zdroj:	Nanoscale Research Letters, Vol 12, Iss 1, Pp 1-5 (2017)
Druh dokumentu:	article
ISSN:	1931-7573 1556-276X
DOI:	10.1186/s11671-017-2012-1
Popis:	Abstract The photoluminescence properties of a thermally activated delayed fluorescence emitter, 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN), doped in a host matrix consisting of 1,3-bis(9-carbazolyl)benzene and a polar inert molecule, camphoric anhydride (CA), in various concentrations have been investigated. It is found that the addition of CA stabilizes only the lowest singlet excited state (S1) of 2CzPN without changing the energy level of the lowest triplet excited state (T1), leading to a reduction in the energy gap between S1 and T1. The maximum reduction of energy gap achieved in this work has been determined to be around 65 meV from the shift of the fluorescence spectrum and the temperature dependence of the photoluminescence decay rate.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/9233883715a344489e46519df72c5615 Zobrazit plný text záznamu Full text from SpringerLink View record in DOAJ