Balaji Dhiyaneshwari, Swati G
Centre for Nanotechnology Research, Vellore Institute of Technology Vellore 632014 Tamil Nadu India
RSC Adv. 2025 Jun 3;15(23):18456-18466. doi: 10.1039/d5ra01415h. eCollection 2025 May 29.
Compared with lead halide perovskites, double perovskites (DPs) have drawn much attention because of their intriguing optoelectronic qualities, environmental stability, and non-toxicity. Herein, we systematically designed a CsNaAgInBiCl:Mn double perovskite by alloying Ag and Bi at the Na and In sites in the host lattice. Ag broke the parity forbidden transition of CsNaInCl, and Bi significantly broadened the emission spectra from 450-700 nm. Doping of Mn further reduced the defect density and enhanced the radiative recombination. Broad emission owing to the T → A transition of Mn ions was observed at 665 nm. Upon doping, the sample exhibited a PLQY of 44.9%. Temperature-dependent emission characteristics of the synthesized double perovskite were also studied. Even at a high temperature of 100 °C, the emission intensity was reduced only by 53%, and the material possessed a high activation energy of 0.46 eV. The optimised sample was physically blended with blue emitting BaMgAlO:Eu to obtain complete spectral color coverage in visible light when excited with a 365 nm UV light source. CIE coordinates of (0.37, 0.39), CCT of 4457.53 K and CRI of 87.4 were obtained for the optimised sample. CsNaAgInBiCl:0.15Mn was found to be a promising luminescent material for enhancing the color rendition index of UV-pumped white LEDs. The as-prepared double perovskite is a multifunctional material that can be used for WLEDs, photodetectors and display screens.
与卤化铅钙钛矿相比，双钙钛矿（DPs）因其引人入胜的光电特性、环境稳定性和无毒特性而备受关注。在此，我们通过在主体晶格的Na和In位点合金化Ag和Bi，系统地设计了一种CsNaAgInBiCl:Mn双钙钛矿。Ag打破了CsNaInCl的宇称禁戒跃迁，Bi显著拓宽了450 - 700 nm的发射光谱。Mn的掺杂进一步降低了缺陷密度并增强了辐射复合。在665 nm处观察到由于Mn离子的T→A跃迁导致的宽发射。掺杂后，样品的光致发光量子产率（PLQY）为44.9%。还研究了合成的双钙钛矿的温度依赖发射特性。即使在100°C的高温下，发射强度仅降低53%，并且该材料具有0.46 eV的高激活能。将优化后的样品与蓝色发光的BaMgAlO:Eu物理混合，当用365 nm紫外光源激发时，在可见光中获得了完整的光谱颜色覆盖范围。优化后的样品的CIE坐标为(0.37, 0.39)，相关色温（CCT）为4457.53 K，显色指数（CRI）为87.4。发现CsNaAgInBiCl:0.15Mn是一种有前途的发光材料，可用于提高紫外泵浦白光发光二极管（WLED）的显色指数。所制备的双钙钛矿是一种多功能材料，可用于WLED、光电探测器和显示屏。
