Efficient Near‐Infrared Luminescence in Lanthanide‐Doped Vacancy‐Ordered Double Perovskite Cs₂ZrCl₆ Phosphors via Te⁴⁺ Sensitization

Abstract

All‐inorganic lead‐free perovskite‐derivative metal halides have shown great promise in optoelectronics, however, it remains challenging to realize efficient near‐infrared (NIR) luminescence in these materials. Herein, we report a novel strategy based on Te4+/Ln3+ (Ln=Er, Nd, and Yb) co‐doping to achieve efficient NIR luminescence in vacancy‐ordered double perovskite Cs2ZrCl6 phosphors, which are excitable by a low‐cost near‐ultraviolet light‐emitting diode (LED) chip. Through sensitization by the spin‐orbital allowed 1S0→3P1 transition of Te4+, intense and multi‐wavelength NIR luminescence originating from the 4f→4f transitions of Er3+, Nd3+, and Yb3+ was acquired, with a quantum yield of 6.1 % for the Er3+ emission. These findings provide a general approach to achieve efficient NIR emission in lead‐free metal halides through ns2‐metal and lanthanide ion co‐doping, thereby opening up a new avenue for exploring NIR‐emitting perovskite derivatives towards versatile applications such as NIR‐LEDs and bioimaging.

Atomic-scale imaging of ytterbium ions in lead halide perovskites

“…Therefore, various lanthanide ions (Ln 3+/2+ : Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ /Eu 2+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ /Yb 2+ , etc.) have been incorporated into perovskites to notably improve their performances and broaden their applications via single-, co-, or tri-doping, respectively (26)(27)(28)(29)(30)(31)(32)(33). Many landmark works have been achieved by the marriage of lanthanide ions with perovskites.…”

Efficient red luminescence in Eu3+doped CdSe/CdS all-inorganic quantum dots shows great potential for wLEDs

“…However, by continuously increasing Eu 3+ concentration to 0.8%, the fluorescence lifetime decreased to 7.83 ms owing to the concentration quenching effect. 32 The unified double exponential behavior of the fluorescence lifetime decay curve suggested that the inorganic CdSe/CdS QDs matrix provided a homogenous electronic transition environment for Eu 3+ ions and certified that Eu 3+ ions were incorporated into the CdSe/CdS QDs lattice.…”

Highly efficient and stable Cs2TeCl6:Cr3+ perovskite microcrystals for white light emitting diodes

“…According to the s → p transitions rule of s 2 ions, the transition of 1 S 0 → 3 P 1 (A band) is partially allowed by spin–orbit coupling (SOC) interaction, and 1 S 0 → 3 P 2 (B band) is forbidden. 21,22 However, the previous reports evidenced that doping would alter the SOC effect. 23–25 Moreover, the octahedral distortion induced by doping breaks partially forbidden s → p transitions.…”