Recent progress in lanthanide ions doped inorganic metal halide perovskites

Benefiting from their large molar extinction coefficient, high carrier mobility, narrow and tunable emissions, inorganic metal halide perovskites (IMHPs) demonstrate great potential in various optoelectrical devices including solar cells, light emitting diodes and photodetectors in the past few years. Metal ions doping, well-known as a modification method of semiconductors, has been extensively applied in IMHPs as well. Diverse metal ions have been doped in IMHPs including alkali metals, alkali earth metals, transition metals and lanthanide metals, which either improve their optical performances or induce intriguing brand–new properties. Among them, lanthanide metals feature plentiful energy levels and stable optical properties and are one of the most noteworthy species. Here we review recent progress in lanthanide ions doped IMHPs. We summarize Yb, Eu or Er ions singly doping in detail, which was the most investigated species in IMHPs. Other lanthanide ions are also reviewed synoptically. Furthermore, we introduce lanthanide ions multi-doped IMHPs and at last we put forward several potential development directions. As the interests in lanthanide ions doped IMHPs rise, researchers have made some achievements in the field. Still though, there are more unexplored issues. Although there are review articles focusing on metal ions doped IMHPs or lanthanide ions doped perovskites, this review aims to provide an overall introduction of lanthanide ions doped IMHPs. This review may help researchers learn about lanthanide ions doped IMHPs and is to inspire researchers to make further promotion in this field.