Bright solid-state luminescence of green-red tunable CdTe@BaCO3 composite: Synthesis and properties.

Realizing efficient solid-state luminescence is of great important to expand quantum dots (QDs) application fields. This work reports the preparation of CdTe@BaCO3 composite by a one-pot precipitation method. Both steady-state PL and PL decay characteristics in either solid-state or colloid solution show no obvious difference, mainly benefited from the effective protection of BaCO3 on QDs from the external environment. By utilizing green and red CdTe QDs as dual-color emission centers, precise emitting-color control from green (0.312, 0.667) to red (0.691, 0.292) could be achieved in CdTe@BaCO3 composite by adjusting volume ratio of CdTe solution precursor. Our results demonstrate that this composite material shows bright solid-state luminescence and facile adjustment of the emitting color in QDs-based composite is feasible, which could offer new path to design color-tunable luminescent materials for future optoelectronic applications.