White light emission in Bi³⁺/Mn²⁺ ion co-doped CsPbCl₃ perovskite nanocrystals

Abstract

Colloidal perovskite nanocrystals (NCs), especially the fully inorganic cesium lead halide (CsPbX, X = Cl, Br, I) NCs, have been considered as promising candidates for lighting and display applications due to their narrow band emission, tunable band gap and high photoluminescence quantum yields (QYs). However, owing to the anion exchange in the CsPbX NCs, stable multi-color and white light emissions are difficult to achieve, thus limiting their practical optoelectronic applications. In this work, dual ion Bi/Mn codoped CsPbCl perovskite NCs were prepared through the hot injection method for the first time to the best of our knowledge. Through simply adjusting the doping ion concentrations, the codoped NCs exhibited tunable emissions spanning the wide range of correlated color temperature (CCT) from 19 000 K to 4250 K under UV excitation. This interesting spectroscopic behaviour benefits from efficient energy transfer from the perovskite NC host to the intrinsic energy levels of Bi or Mn doping ions. Finally, taking advantage of the cooperation between the excitonic transition of the CsPbCl perovskite NC host and the intrinsic emissions from Bi and Mn ions, white light emission with the Commission Internationale de l'Eclairage (CIE) color coordinates of (0.33, 0.29) was developed in the codoped CsPbCl NCs.

Highly Efficient and Stable Inorganic Perovskite Quantum Dots by Embedding into a Polymer Matrix

“…During the heating process, the PMMA undergo melting and swelling, part of the precursors (lead oleate and halogenated amine) could be encapsulated inside of PMMA in this process. After adding the precursor of cesium oleate, nucleation and growth of perovskite QDs took place inside of the PMMA ,,. Then, the reaction was terminated by ice bath, meanwhile, the perovskite QDs were readily capped by the shrinking PMMA.…”

Efficient and Stable CsPb(Br/I)3@Anthracene Composites for White Light-Emitting Devices

“…26,27 Very recently, single-phase white materials have been reported; these materials emit white light through doping perovskites. 28–30 Nevertheless, these processes are generally complex. 31 …”

Reversible Ultra‐Slow Crystal Growth of Mixed Lead Bismuth Perovskite Nanocrystals: The Presence of Dynamic Capping

“…[9] Amongt hese, bismuth (Bi)-based perovskites provideabetter stabilityi nt he ambient condition, which is very much required for the application of these materials. [12,13] In our previous study,w eh ave also reported the potentialo ft hese charge-balanced hybrid Pb-Bi perovskite thin films forsolar cell applications. [11] Therefore, it is ap rimary concernt os earch for as ystem with high quantum yield withoutc ompromising stability.…”