Size-Dependent Effects in EPR and Luminescence Spectra of NH4BPh4 Excited States: From Bulk to Nanoparticles
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Applied Magnetic Resonance
ISSN: 0937-9347
, E-ISSN: 1613-7507
|
| Output data |
Year: 2011,
Volume: 40,
Number: 4,
Pages: 459-469
Pages count
: 11
DOI:
10.1007/s00723-011-0214-8
|
| Tags |
TETRAPHENYLBORATE; CATIONS; IONS; DYES |
| Authors |
Antonova O.V.
1
,
Nadolinny V.A.
1
,
Ilʹinchik E.A.
1
,
Kovalev M.K.
2
,
Yelisseyev A.P.
3
|
| Affiliations |
| 1 |
Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences,
Novosibirsk, Russia
|
| 2 |
Boreskov Institute of Catalysis, Siberian Branch of Russian Academy of Sciences,
Novosibirsk, Russia
|
| 3 |
Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences,
Novosibirsk, Russia
|
|
Funding (1)
Photoexcited states of NH4BPh4 (TPhBA) particles embedded in mesoporous frameworks of different pore sizes were studied by combined electron paramagnetic resonance (EPR), optical and photoluminescence techniques. A distribution of triplet states with short and long electron–hole distances was found. While EPR studies on TPhBA bulk sample suggested that the formation of electron–hole pairs upon the excitation was caused by electron capture on electron traps, the samples in mesoporous frameworks exhibit two ways of the pair formation. The first one is attributed to the capture on phenyl rings and another one is to be thought as the capture of electrons on adsorbed oxygen molecules. These results are also consistent with the thermoluminescence spectra and EPR studies of the photoexcited samples during annealing.