Zhao Ying, Yu Feifei, Tian Zhennan, Chen Huanyu, Wang Caizheng, Sun Wenfeng, Bai Sai, Yu Junsheng, Xue Shuwen, Zu Xiaotao, Li Sean, Xiang Xia
School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China.
School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
J Colloid Interface Sci. 2025 Nov;697:138000. doi: 10.1016/j.jcis.2025.138000. Epub 2025 May 26.
Commercial tunable white light-emitting diodes (WLEDs) fabricated through multi-component mixing encounter high costs, complex control systems, and color-shift issues. Therefore, developing innovative single-component tunable luminescent materials is expected to overcome these limitations. In recent years, the vacancy-ordered perovskite CsSnCl has attracted considerable research interest in the luminescence field due to its lead-free composition, notable chemical stability, inherent self-trapped excitons (STEs) emission behavior, and modifiable optical characteristics. In this work, Se-doped CsSnCl microcrystals were prepared via a one-step solvothermal method. The doping of Se can introduce a new luminescence center featuring a yellow emission band compared with the single blue emission of the pristine CsSnCl. Based on the experimental findings and the density functional theory (DFT) calculations, the blue and yellow emissions stem from the STEs luminescence caused by the excitons within the [SnCl] and [SeCl] octahedral lattices, respectively. Notably, the tunable white light can be achieved by adjusting the excitation wavelength and precisely controlling the relative intensities of blue and yellow emissions. Furthermore, the Se-doped CsSnCl microcrystals exhibit excellent structural and luminescent stability, demonstrating their remarkable capacity to withstand harsh environments, including immersion in water and exposure to high temperatures. Importantly, the single-component tunable WLEDs ranging from cool white to warm white were fabricated by combining 3 % Se-doped CsSnCl with NUV chips. Overall, this study provides novel perspectives on the dual emission of single-ion doped lead-free perovskites. It also presents a new route to achieving stable and tunable white light, effectively surmounts multi-component WLEDs limitations, and holds promise for high-end lighting and display applications.
通过多组分混合制备的商用可调谐白光发光二极管（WLED）面临成本高、控制系统复杂和色移问题。因此，开发创新的单组分可调谐发光材料有望克服这些限制。近年来，空位有序钙钛矿CsSnCl因其无铅成分、显著的化学稳定性、固有的自陷激子（STE）发射行为和可调节的光学特性，在发光领域引起了相当大的研究兴趣。在这项工作中，通过一步溶剂热法制备了Se掺杂的CsSnCl微晶。与原始CsSnCl的单一蓝色发射相比，Se的掺杂可以引入一个具有黄色发射带的新发光中心。基于实验结果和密度泛函理论（DFT）计算，蓝色和黄色发射分别源于[SnCl]和[SeCl]八面体晶格内激子引起的STE发光。值得注意的是，通过调节激发波长并精确控制蓝色和黄色发射的相对强度，可以实现可调谐白光。此外，Se掺杂的CsSnCl微晶表现出优异的结构和发光稳定性，证明了它们在包括浸入水中和暴露于高温等恶劣环境下的显著耐受能力。重要的是，通过将3%的Se掺杂CsSnCl与NUV芯片相结合，制备了从冷白到暖白的单组分可调谐WLED。总体而言，这项研究为单离子掺杂无铅钙钛矿的双发射提供了新的视角。它还提出了一条实现稳定和可调谐白光的新途径，有效克服了多组分WLED的局限性，并有望应用于高端照明和显示领域。
