Actively collecting the mechanical energy by efficient conversion to other forms
of energy such as light opens a new possibility of energy-saving, which is of
pivotal significance for supplying potential solutions for the present energy
crisis. Such energy conversion has shown promising applications in modern
sensors, actuators, and energy harvesting. However, the implementation of
such technologies is being hindered because most luminescent materials
show weak and non-recoverable emissions under mechanical excitation.
Herein, a new class of heterojunctioned ZnS/CaZnOS piezophotonic systems
is presented, which displays highly reproducible mechanoluminescnce
(ML) with an unprecedented intensity of over two times higher than that of
the widely used commercial ZnS (the state-of-the-art ML material). Density
functional theory calculations reveal that the high-performance ML originates
from efficient charge transfer and recombination through offset of the valence
and conduction bands in the heterojunction interface region. By controlling the
ZnS-to-CaZnOS ratio in conjunction with manganese (Mn
2
+
) and lnthanide
(Ln
3
+
) doping, tunable ML across the full spectrum is activated by a small
mechanical stimulus of 1 N (10 kPa). The findings demonstrate a novel
strategy for constructing efficient ML materials by leveraging interface effects
and ultimately promoting practical applications for ML.
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