Publication date: 2nd November 2020
Lead halide perovskites have attracted recent attention because of their excellent optoelectronic properties for applications such as solar cell and light emitting diodes (LEDs). However, toxicity of lead and instability have posed challenges for their commercial application. In view of this, efforts are made to search for stable and Lead-free perovskites with desired optoelectronic properties. Replacement of Pb2+ with both isovalent or heterovalent ions is being considered. One such example is double perovskites where two lead ions are replaced by one monovalent and one trivalent ion. Here we dope lanthanides in Cs2AgInCl6 double perovskites to add new functionality, namely near infrared emission. Prior reports in the case of oxide perovskites have shown significant enhancement in the photoluminescence efficiency by codoping of lanthanides with bismuth. Motivated by that, we prepared Bi3+-Ln3+ (Ln = Er and Yb) codoped Cs2AgInCl6 double perovskite by acid precipitation method. The resulting codoped samples show new near infrared (NIR) emission at 1540 nm and 994 nm, when Er3+ and Yb3+ are used as lanthanides respectively. Photoluminescence originated at 1540 nm and 994 nm are because of 4I13/2→4I15/2 transition of Er3+ and 2F5/2→2F7/2 transition of Yb3+ respectively. Such NIR emissive materials are demanding for NIR LEDs, and more importantly, the 1540 nm emission falls in the exact range of loss-less optical communication.
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