Pb 2+ /Mn 2+ co-doping enables blue-to-white luminescence tuning in Rb₃Cd₂Cl₇ metal halide perovskites

centers, achieved a PLQY of 75.4% for white light emission. The white light-emitting diodes exhibit an excellent color rendering index of 94.1, which is exceptional among recent devices compared to those based on Cd. This underscores its potential for significant applications in the optoelectronic field and offers a new alternative material for perovskite blue and white LEDs.