Impurity doping is an effective approach to tuning the optoelectronic performance of host materials by imparting extrinsic electronic channels. Herein, a family of lanthanide (Ln3+) ions was successfully incorporated into a Bi:Cs2AgInCl6 lead-free double-perovskite (DP) semiconductor, expanding the spectral range from visible (Vis) to near-infrared (NIR) and improving the photoluminescence quantum yield (PLQY). After multidoping with Nd, Yb, Er and Tm, Bi/Ln: Cs2AgInCl6 yielded an ultrabroadband continuous emission spectrum with a full width at half-maximum of～365 nm originating from intrinsic self-trapped exciton recombination and abundant 4f–4f transitions of the Ln3+dopants. Steady-state and transient-state spectra were used to ascertain the energy transfer and emissive processes. To avoid adverse energy interactions between the various Ln3+ions in a single DP host, a heterogeneous architecture was designed to spatially confine different Ln3+dopants via a"DP-in-glass composite"(DiG) structure. This bottom-up strategy endowed the prepared Ln3+-doped DIG with a high PLQY of 40％(nearly three times as high as that of the multidoped DP) and superior long-term stability. Finally, a compact Vis–NIR ultrabroadband (400～2000 nm) light source was easily fabricated by coupling the DiG with a commercial UV LED chip, and this light source has promising applications in nondestructive spectroscopic analyses and multifunctional lighting.

Shilin Jin;Renfu Li;Hai Huang;Naizhong Jiang;Jidong Lin;Shaoxiong Wang;Yuanhui Zheng;Xueyuan Chen;Daqin Chen

College of Physics and Energy,Fujian Normal University,Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials,Fuzhou 350117,China;Fujian Science&Technology Innovation Laboratory for Optoelectronic Information,Fuzhou 350116,China;CAS Key Laboratory of Design and Assembly of Functional Nanostructures,Fujian Key Laboratory of Nanomaterials and State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,Fujian 350002,China;Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering,Fuzhou 350117,China;Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage,Fuzhou 350117,China;College of Chemistry,Fuzhou University,Fuzhou 350116,China

光：科学与应用（英文版）

[1]Shilin Jin;Renfu Li;Hai Huang;Naizhong Jiang;Jidong Lin;Shaoxiong Wang;Yuanhui Zheng;Xueyuan Chen;Daqin Chen-.Compact ultrabroadband light-emitting diodes based on lanthanide-doped lead-free double perovskites)[J].光：科学与应用（英文版）,2022(03):383-395

Cs2AgInCl6,multidoping,Ln3+dopants,Ln3+ions,DiG,multidoped

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