posted on 2016-07-14, 16:03authored byChen-Yu Mao, Wei-Qiang Liao, Zhong-Xia Wang, Zainab Zafar, Peng-Fei Li, Xing-Hui Lv, Da-Wei Fu
Molecular optical-electrical duple
switches (switch “ON” and “OFF” bistable
states) represent a class of highly desirable intelligent materials
because of their sensitive switchable physical and/or chemical responses,
simple and environmentally friendly processing, light weights, and
mechanical flexibility. In the current work, the phase transition
of 1 (general formula R2MX5, [C5N2H16]2[SbBr5])
can be triggered by the order–disorder transition of the organic
cations at 278.3 K. The temperature-induced phase transition causes
novel bistable optical-electrical duple characteristics, which indicates
that 1 might be an excellent candidate for a potential
switchable optical-electrical (fluorescence/dielectric) material.
In the dielectric measurements, remarkable bistable dielectric responses
were detected, accompanied by striking anisotropy along various crystallographic
axes. For the intriguing fluorescence emission spectra, the intensity
and position changed significantly with the occurrence of the structural
phase transition. We believe that these findings might further promote
the application of halogenoantimonates(III) and halogenobismuthates(III)
in the field of optoelectronic multifunctional devices.