Journal Article light-emitting diodes luminescent materials Halide perovskite materials Review bioinspired carbon dots co-host strategy color converters deep-red fluorescent actuator lanthanide dopants laser lighting laser‐driven projection displays lead-free double perovskites multifunctional narrow-bandwidth emission narrowband emitters perovskite quantum dot phosphor‐in‐glass photonic and optoelectronic applications photonic properties preparation of RE‐HP composites projection display quantum dots rare‐earth elements self-trapped excitons self‐healing transparent ceramics upconversion