TY - JOUR

T1 - TADF and X-ray Radioluminescence of New Cu(I) Halide Complexes: Different Halide Effects on These Processes

AU - Artem'ev, Alexander V

AU - Baranov, Andrey Yu

AU - Berezin, Alexey S

AU - Stass, Dmitry V

AU - Hettstedt, Christina

AU - Kuzmina, Ul'yana A

AU - Karaghiosoff, Konstantin

AU - Bagryanskaya, Irina Yu

N1 - Funding: This work was supported by Russian Science Foundation (Project № 21-73-10110) and the Ministry of Science and Higher Education of the Russian Federation (projects №121031700321-3, №121031700313-8, and №1021051503141-0-1.4.1).

PY - 2023/3/7

Y1 - 2023/3/7

N2 - A series of complexes [Cu2X2(Pic3PO)2] (X = Cl, Br, I) based on tris(pyridin-2-ylmethyl)phosphine oxide (Pic3PO) has been synthesized. At 298 K, these compounds exhibit thermally activated delayed fluorescence (TADF) of 1(M+X)LCT type with λmax varying from 485 to 545 nm, and quantum efficiency up to 54%. In the TADF process, the halide effect appears as the emission intensification and bathochromic shift of λmax in the following order X = I < Br < Cl. Upon X-ray irradiation, the title compounds emit radioluminescence, the emission bands of which have the same shape as those at TADF, thereby meaning a similar radiative excited state. By contrast to TADF, the halide effect in the radioluminescence is reversed: its intensity grows in the order X = Cl < Br < I, since heavier atoms absorb X-rays more efficiently. These findings essentially contribute to our knowledge about the halide effect in the photo- and radioluminescent Cu(I) halide emitters.

AB - A series of complexes [Cu2X2(Pic3PO)2] (X = Cl, Br, I) based on tris(pyridin-2-ylmethyl)phosphine oxide (Pic3PO) has been synthesized. At 298 K, these compounds exhibit thermally activated delayed fluorescence (TADF) of 1(M+X)LCT type with λmax varying from 485 to 545 nm, and quantum efficiency up to 54%. In the TADF process, the halide effect appears as the emission intensification and bathochromic shift of λmax in the following order X = I < Br < Cl. Upon X-ray irradiation, the title compounds emit radioluminescence, the emission bands of which have the same shape as those at TADF, thereby meaning a similar radiative excited state. By contrast to TADF, the halide effect in the radioluminescence is reversed: its intensity grows in the order X = Cl < Br < I, since heavier atoms absorb X-rays more efficiently. These findings essentially contribute to our knowledge about the halide effect in the photo- and radioluminescent Cu(I) halide emitters.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85151113774&origin=inward&txGid=3ac8eca65eca2f52b298a6163a9563ed

UR - https://www.mendeley.com/catalogue/d6340f8c-3ccb-37e5-954c-32fb3304eb7a/

U2 - 10.3390/ijms24065145

DO - 10.3390/ijms24065145

M3 - Article

C2 - 36982219

VL - 24

JO - International Journal of Molecular Sciences

JF - International Journal of Molecular Sciences

SN - 1661-6596

IS - 6

M1 - 5145

ER -