Premium
The Luminescence of K 4 Bi 2 Br 10 · 4 H 2 O and Rb 3 BiBr 6 Single Crystals
Author(s) -
Timmermans C. W. M.,
Blasse G.
Publication year - 1983
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221180141
Subject(s) - luminescence , dimer , quenching (fluorescence) , chemistry , crystallography , materials science , analytical chemistry (journal) , fluorescence , physics , optics , optoelectronics , organic chemistry , chromatography
The luminescence properties of K 4 Bi 2 Br 10 · 4 H 2 O and Rb 3 BiBr 6 are reported. Both compounds show blue luminescence at low temperatures. For Rb 3 BiBr 6 the luminescence is ascribed to the 3 P 0 → 1 S 0 transition on the isolated Bi 3+ centre, while in K 4 Bi 2 Br 10 · 4 H 2 O the luminescence originates from the [Bi 2 Br 10 ] 4− dimers. The energy level diagram of the dimer centre is approached by using simple MO‐theory. The compound K 4 Bi 2 Br 10 · 4 H 2 O shows also an emission band in the red, which is ascribed to a charge‐transfer transition. The quenching of the luminescence is caused by energy migration among the dimers in K 4 Bi 2 Br 10 · 4 H 2 O, while in Rb 3 BiBr 6 the luminescence is quenched via the charge‐transfer state.