TY - JOUR

T1 - Excitation wavelength-dependent room-temperature phosphorescence: unusual properties of novel phosphinoamines

AU - Khisamov, R. M.

AU - Ryadun, A. A.

AU - Sukhikh, T. S.

AU - Konchenko, S. N.

N1 - Funding Information: This work is supported by the Russian Science Foundation (project no. 21-13-00287). We are grateful to the Siberian Supercomputer Centre of the Institute of Computational Mathematics and Mathematical Geophysics for computational capability and thank the technical staff of the Institute for their assistance. The XRD and the luminescence studies were carried out with the support of the Ministry of Science and Higher Education of the Russian 121031700313-8 and No. 121031700321-3). Publisher Copyright: © The Royal Society of Chemistry.

PY - 2021/12/1

Y1 - 2021/12/1

N2 - Exploring pure organic single-component materials featuring room-temperature phosphorescence and excitation-dependent color-tunability has attracted great attention in recent years. Such challenging materials are highly demanded for the OLED industry and are very interesting from a photochemistry perspective. Herein, we report the synthesis of novel phenylbenzothiazole derivatives 1-3 bearing phosphine groups. The compounds demonstrate dual band emission, whose intensity depends on the excitation wavelength of ultraviolet light both in the solid state and in solution. Owing to the fact that the emission bands cover the entire visible range, manipulating the excitation wavelength allows one to achieve a white glowing of the compounds. In addition, the emission kinetics data reveal a lifetime of hundreds of microseconds, which implies a phosphorescent nature of the emission. To rationalize the unusual properties, a combination of pathways for the radiative process is suggested: 1) the transition between excited states with different molecular geometry, viz. locally excited state (LE) and a charge transfer state (TICT); 2) excited state intramolecular proton transfer (ESIPT). These mechanisms are interpreted by means of quantum chemical DFT calculations. This journal is

AB - Exploring pure organic single-component materials featuring room-temperature phosphorescence and excitation-dependent color-tunability has attracted great attention in recent years. Such challenging materials are highly demanded for the OLED industry and are very interesting from a photochemistry perspective. Herein, we report the synthesis of novel phenylbenzothiazole derivatives 1-3 bearing phosphine groups. The compounds demonstrate dual band emission, whose intensity depends on the excitation wavelength of ultraviolet light both in the solid state and in solution. Owing to the fact that the emission bands cover the entire visible range, manipulating the excitation wavelength allows one to achieve a white glowing of the compounds. In addition, the emission kinetics data reveal a lifetime of hundreds of microseconds, which implies a phosphorescent nature of the emission. To rationalize the unusual properties, a combination of pathways for the radiative process is suggested: 1) the transition between excited states with different molecular geometry, viz. locally excited state (LE) and a charge transfer state (TICT); 2) excited state intramolecular proton transfer (ESIPT). These mechanisms are interpreted by means of quantum chemical DFT calculations. This journal is

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U2 - 10.1039/d1me00117e

DO - 10.1039/d1me00117e

M3 - Article

VL - 6

SP - 1056

EP - 1065

JO - Molecular systems design & engineering

JF - Molecular systems design & engineering

SN - 2058-9689

IS - 12

ER -