Bi3+/Te4+ co-doped
Cs2SnCl6 with dual emission spectrum (i.e.,
450 and 575 nm) was achieved
by a modified solution method, which can overcome the phase separation
in the previous method for Cs2SnCl6 crystal
growth. The two emission peaks arising from the two dopants Bi3+ and Te4+ have distinct photoluminescence (PL)
lifetimes. Thus, the control of dopant ratio or PL delay time will
regulate the PL intensity ratio between 450 and 575 nm peaks leading
to adjustable emission color. The energy transfer between the two
emission centers, which is confirmed by the optical spectra and PL
lifetime, has a critical distance around 7.8 nm with a maximum of
50% transfer efficiency. The Bi3+/Te4+ co-doped
Cs2SnCl6 with superior stability in water and
aqua regia was fabricated into a single-phase white light-emitting
diode. In the meantime, various luminescent heterostructures were
obtained by epitaxial Cs2SnCl6 crystal growth
with different dopants, which can broaden the study of composition
engineering in halide perovskites.
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