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.