Synthesis of All-Inorganic Cd-Doped CsPbCl₃ Perovskite Nanocrystals with Dual-Wavelength Emission

Abstract

Doped lead halide perovskite nanocrystals (NCs) have garnered significant attention due to their superior optoelectronic properties. Here, we report a synthesis of Cd-doped CsPbCl 3 NCs by decoupling Pb-and Cl-precursors in a hot injection method. The resulting Cd-doped perovskite NCs manifest a dual-wavelength emission profile with the first reported example of Cd-dopant emission. By controlling Cd-dopant concentration, the emission profile can be tuned with a dopant emission quantum yield of up to 8%. A new secondary emission (∼610 nm) is induced by an energy transfer process from photoexcited hosts to Cd-dopants and a subsequent electronic transition from the excited state ( 3 E g ) to the ground state ( 1 A 1g ) of [CdCl 6 ] 4− units. This electronic transition matches well with a first-principles density functional theory calculation. Further, the optical behavior of Cd-doped CsPbCl 3 NCs can be altered through postsynthetic anion-exchange reactions. Our studies present a new model system for doping chemistry studies in semiconductors for various optoelectronic applications.

Mn2+/Yb3+ Codoped CsPbCl3 Perovskite Nanocrystals with Triple‐Wavelength Emission for Luminescent Solar Concentrators

“…Incorporation of impurity ions (also known as the doping process) into perovskite nanocrystals (NCs) has proven as a unique and effective means to alter and enhance the magnetic, magneto‐optical and optoelectronic properties of the host perovskite NCs. [ 1–6 ] To date, various excellent dopant examples have been demonstrated including main group elements (e.g., Al, Ca, Sr, Bi), [ 7–10 ] transition metals (e.g., Mn, Ni, Cd), [ 11–25 ] and rare earth elements (e.g., Yb, Ce, Pr). [ 26–37 ] Among all the dopant‐induced properties, the emergence of new emission bands due to the introduction of additional radiative relaxation channels of excitons has been intriguing and promising in particular.…”

“…demonstrated including main group elements (e.g., Al, Ca, Sr, Bi), [7][8][9][10] transition metals (e.g., Mn, Ni, Cd), [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] and rare earth elements (e.g., Yb, Ce, Pr). [26][27][28][29][30][31][32][33][34][35][36][37] Among all the dopant-induced properties, the emergence of new emission bands due to the introduction of additional radiative relaxation channels of excitons has been intriguing and promising in particular.…”

Inhibition of Phase Segregation in Cesium Lead Mixed-Halide Perovskites by B-Site Doping

“…Therefore, B-site doping with Mn 2+ ions should be a promising way to inhibit the light-induced phase segregation of mixed-halide perovskite materials and can simultaneously improve the stability in ambient atmosphere. In addition, other divalent cations including Zn 2+ , Cd 2+ , and alkaline-earth metals are reported to have been successfully incorporated into CsPbX 3 nanocrystals ( Cai et al., 2018 ; Chen et al., 2019 ; van der Stam et al., 2017 ). We believe that the doping of these ions will also affect the stability of the materials.…”

Recent advances in metal halide perovskite photocatalysts: Properties, synthesis and applications

“…The selective evolution of major products observed for doped NCs was correlated to the adsorption/desorption energy of respective products. In addition, other dopants, such as Fe 3+ [183], Cd 2+ [184], and Bi 3+ [185] were also successfully introduced into the MHP NCs, respectively. Therefore, doping strategy may provide us a new route to tune the charge separation and recombination kinetics in photocatalysts.…”