Highly efficient single-source white light emission of lead-free double perovskites via ions doping

Lead-free perovskite is a non-toxic and environmentally friendly material, which plays an increasingly significant role in photodetection, luminescence, photovoltaics and so on. In this paper, a single-component white light emission is successfully achieved through the co-doping of Sb3+, Mn2+ and Tb3+ in Cs2NaInCl6. The photoluminescent mechanism is proved through the spectra measurements and decay dynamics. The addition of Sb3+ could activate the self-trapped exciton (STE) emission of the matrix (blue light at 450 nm). The efficient energy transfer from STE emission could realize red light emission of Mn2+, and green light emission of Tb3+. The single-component white light emission is obtained with the Commission Internationale de L'Eclairage of (0.31, 0.35), high color rendering index of 88.1 and correlated color temperature of 6394 K. Finally, the prepared white light emitting diodes demonstrate high performance and excellent stability. This provides a new idea for development of lead-free perovskite white luminescent materials in display and lighting applications.