Qilin Wei,Xianfu Meng,Wenchao Lin,Shuaigang Ge,Xinxin Han,Li Chen,Ruosheng Zeng,Bingsuo Zou
Metal halide materials have recently sparked intense research because of their excellent photophysical properties and chemical stability. For example, RbCdCl3:Sb3+ exhibits broad emission at about 600 nm with a high photoluminescence quantum yield (PLQY) over 91% and double emission bands with bright white color. Herein, we obtained a novel Rb and Cd layered perovskite Rb3Cd2Cl7 doped with Sb3+, which gives luminescence at 525 nm with a large Stokes shift of 200 nm, originating from a self-trapped exciton (STE). Its PLQY is 57.47%, but its low-temperature PLQY becomes much higher at the same wavelength. When Rb3Cd2Cl7:Sb3+ and RbCdCl3:Sb3+ were compared, the two classes of quantum confinement effects by Rb and Cd ions in the lattice were identified to describe their electronic states and different optical properties. These results suggest that properties of Sb-doped cadmium halides could be modified by the structure type and local atomic confinement to find applications as promising luminescent materials for optoelectronic devices.
Dayu Huang,Pan Zheng,Ziyong Cheng,Qiuyun Ouyang,Hongzhou Lian,Jun Lin
It is of great interest to obtain multiple luminescent products from a single reaction, such as existing core–shell nanomaterials and heterojunction nanomaterials, all with the aim of enriching the photoelectric properties of the materials. Here, we report a hydrothermal approach for creating crystals of needle-shaped RbCdCl3:Sb3+ and bulk-shaped Rb4CdCl6:Sb3+, two antimony doped-cadmium based metal halides. Two crystal materials with different shapes and phases can be synthesized simultaneously at the same stoichiometric ratio. RbCdCl3:Sb3+ is needle-shaped, whereas Rb4CdCl6:Sb3+ is bulk-shaped. Under 320 nm excitation wavelength irradiation, blue emission (490 nm) of Rb4CdCl6:Sb3+ and yellow emission (560 nm) of RbCdCl3:Sb3+ can be attained. Interestingly at low temperatures RbCdCl3:Sb3+ shows double peaked emissions (460 and 560 nm). This study investigates Sb3+-doped RbCdCl3 crystals that exhibit double luminescence as a result of intrinsic host self-trapped excitons and extrinsic dopant-induced self-trapped excitons (STEs), which are referred to as host STEs and Sb3+ dopant STEs, respectively. The construction of multicolor light-emitting devices is made possible by their color kinetics characteristics.
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