Saikia Sajid, Joshi Aprajita, Arfin Habibul, Badola Shalini, Saha Surajit, Nag Angshuman
Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, 411008, India.
Department of Physics, Indian Institute of Science Education and Research, Bhopal, 462066, India.
Angew Chem Int Ed Engl. 2022 Aug 8;61(32):e202201628. doi: 10.1002/anie.202201628. Epub 2022 Jun 30.
Cs NaInCl double perovskite is stable, environmentally benign and easy to prepare. But it has a wide band gap (5.1 eV), and therefore, does not show optical and optoelectronic properties in the visible and short-wave infrared (SWIR) region. Here we introduce such functionalities in Cs NaInCl by codoping Sb (s-electron doping) and Er (f-electron doping) ions. Sb doping introduces optically allowed 5s 5s 5p electronic absorption at the sub-band gap level, which then emits blue photoluminescence with ≈93 % quantum yield. But f-f electronic absorption of Er is parity forbidden. Codoping Sb -Er , leads to transfer of excitation energy from Sb to Er , yielding SWIR emission at 1540 nm. Temperature (6 to 300 K) dependent photoluminescence measurements elucidate the excitation and emission mechanism. A phosphor converted light emitting diode (pc-LED) fabricated by using the codoped sample emits stable blue and SWIR radiation over prolonged (84 hours) operation at 5.1 V.
CsNaInCl双钙钛矿稳定、对环境无害且易于制备。但其带隙较宽（5.1电子伏特），因此在可见光和短波红外（SWIR）区域不显示光学和光电特性。在此，我们通过共掺杂Sb（s电子掺杂）和Er（f电子掺杂）离子，将此类功能引入CsNaInCl中。Sb掺杂在子带隙能级引入光学允许的5s 5s 5p电子吸收，随后发射出量子产率约为93%的蓝色光致发光。但Er的f-f电子吸收是宇称禁戒的。共掺杂Sb-Er会导致激发能从Sb转移到Er，从而在1540纳米处产生SWIR发射。温度（6至300开尔文）依赖的光致发光测量阐明了激发和发射机制。使用共掺杂样品制造的磷光体转换发光二极管（pc-LED）在5.1伏电压下长时间（84小时）运行时，会发射稳定的蓝色和SWIR辐射。
