A method for preparation of perovskite quantum dot (PQD)/polymer/ceramic ternary complex includes encapsulation of bifunctional coating including ceramic and polymer. Encapsulation sequence of polymer and ceramic may be altered according to the application. In one scenario, the perovskite quantum dots may be protected with ceramic coating first and further coated with polymer to obtain the perovskite/ceramic/polymer ternary complex. In another scenario, the perovskite quantum dots may be protected with polymer coating first and followed by ceramic coating to obtain the perovskite/polymer/ceramic ternary complex. The PQD ternary complex may provide synergistic effect on improvement of stability towards heat and moisture when compared to existing technology.