Li Yanbiao, Gao Yuefeng
College of Marine Engineering, Dalian Maritime University, Dalian 116026, China.
Materials (Basel). 2025 Apr 22;18(9):1896. doi: 10.3390/ma18091896.
Stable and efficient inorganic lead-free double perovskites are crucial for high-reliability optoelectronic devices. However, dual-doped perovskite phosphors often suffer from poor color stability due to differences in thermal activation energies and electron-phonon interactions between the doped ions. To address this, single-doped Sb-incorporated RbHfCl perovskite crystals were synthesized via a co-precipitation method. Under UV excitation, RbHfCl:Sb exhibits broad dual emission bands, attributed to singlet and triplet self-trapped exciton radiative transitions induced by Jahn-Teller distortion in [SbCl] octahedra. This dual emission endows the material with high sensitivity to excitation wavelengths, enabling tunable luminescence from cyan to orange-red across 400-800 nm. Utilizing this dual emission, a white LED was fabricated, showcasing a high color rendering index and excellent long-term stability. Remarkably, the material exhibits breakthrough thermal stability, maintaining more than 90% of its emission intensity at 100 °C, while also exhibiting remarkable resistance to humidity and oxygen exposure. Compared to co-doped phosphors, RbHfCl:Sb offers advantages such as environmental friendliness, simple fabrication, and stable performance, making it an ideal candidate for WLEDs. This study demonstrates notable progress in developing thermally stable and reliable optoelectronic devices.
稳定且高效的无机无铅双钙钛矿对于高可靠性光电器件至关重要。然而，由于掺杂离子之间的热激活能和电子 - 声子相互作用存在差异，双掺杂钙钛矿磷光体常常存在颜色稳定性差的问题。为了解决这一问题，通过共沉淀法合成了单掺杂锑的铷铪氯钙钛矿晶体。在紫外光激发下，铷铪氯钙钛矿：锑呈现出宽的双发射带，这归因于[锑氯]八面体中 Jahn - Teller 畸变诱导的单重态和三重态自陷激子辐射跃迁。这种双发射赋予该材料对激发波长的高灵敏度，能够在 400 - 800 nm 范围内实现从青色到橙红色的可调谐发光。利用这种双发射，制备了一种白色发光二极管，其具有高显色指数和出色的长期稳定性。值得注意的是，该材料表现出突破性的热稳定性，在 100℃时仍保持其发射强度的 90%以上，同时还表现出对湿度和氧气暴露的显著抗性。与共掺杂磷光体相比，铷铪氯钙钛矿：锑具有环境友好、制备简单和性能稳定等优点，使其成为白色发光二极管的理想候选材料。这项研究在开发热稳定且可靠的光电器件方面取得了显著进展。
