Visible transparent white light emitting ink from a Ce3+ sensitized monodispersed Tb,Sm co-doped LaF3@C-dot nanocomposite

Abstract

Bright white light emission (CIE values 0.32 and 0.33) has been achieved by a single excitation source (254 nm) from a monodispersed nanocomposite composed of Ce³⁺, Tb³⁺ and Sm³⁺ doped LaF₃ nanocrystals (NCs) and N-doped C-dots where Ce³⁺ acts as an excellent sensitizer. Controlled deposition of the C-dots onto the surface of the LaF₃ NCs impedes conventional aggregation induced quenching (AIQ) of the C-dots in solid state. The transparent colloidal ink was coated onto an UV chip to fabricate a white light emitting diode (WLED) with a luminous efficacy of 8.72 lm W⁻¹.