Ahmad Faizan, Lassoued Mohamed Saber, Chen Wei-Peng, Gou Gao-Yang, Zheng Yan-Zhen
School of Chemistry, Xi'an Jiaotong University, 99 Yanxiang Road, Xi'an, Shaanxi 710054, P R. China.
Frontier Institute of Science and technology, Xi'an Jiaotong University, 99 Yanxiang Road, Xi'an, Shaanxi 710054, P R. China.
ACS Appl Mater Interfaces. 2024 Jun 19;16(24):31067-31075. doi: 10.1021/acsami.4c03070. Epub 2024 Jun 10.
Although organic-inorganic hybrid one-dimensional (1D) lead halide postperovskites (LHPPs) have been reported to show white luminescence and tunable photoluminescence quantum yield (PLQY), their structure-property relationships are not fully understood. Here, we used Mn to test the doping effect on the luminescence of two 1D-LHPPs compounds, namely, {TETA[PbBr]} and {TETA[PbCl]} , where TETA = triethylenetetrammonium. We found the pristine compounds show yellowish (551 nm) and bluish (447 nm) emission for and , respectively, nanosecond excitation lifetimes (4.17 ns for and 2.29 ns for ) and low PLQYs (4.65 and 3.57% for and , respectively). By fine-doping the Mn ions to ca. 8% the PLQYs for and are maximized to 24 and 25% for and , respectively. Upon the increasing Mn dopant, the emission wavelengths can also vary gradually from 551 to 615 nm and from 447 to 660 nm for and , respectively, covering almost the whole visible-light range, and the excitation lifetimes are enhanced to microseconds (0.77 μs for and 0.39 μs for ), owing to the more spin-forbidden d-d transition (T-A) component from the Mn ions present in the photoluminescence spectra. Moreover, these Mn-doped 1D-LHPPs demonstrate high structural and optical stability in humid and high-temperature environments. Hence, such doped materials can be fabricated into a UV-pumped white light-emitting diode, rendering the potential application for solid-state lighting and display systems.
尽管有机-无机杂化一维（1D）卤化铅后钙钛矿（LHPPs）已被报道具有白色发光和可调谐的光致发光量子产率（PLQY），但其结构-性能关系尚未完全理解。在此，我们使用锰来测试其对两种一维LHPPs化合物发光的掺杂效应，即{TETA[PbBr]}和{TETA[PbCl]}，其中TETA = 三亚乙基四胺。我们发现原始化合物分别在551 nm和447 nm处呈现淡黄色和蓝色发射，具有纳秒级的激发寿命（分别为4.17 ns和2.29 ns）以及较低的PLQY（分别为4.65%和3.57%）。通过将锰离子精细掺杂至约8%，{TETA[PbBr]}和{TETA[PbCl]}的PLQY分别最大化至24%和25%。随着锰掺杂剂的增加，发射波长也会逐渐变化，{TETA[PbBr]}从551 nm变化到615 nm，{TETA[PbCl]}从447 nm变化到660 nm，几乎覆盖了整个可见光范围，并且激发寿命延长至微秒级（{TETA[PbBr]}为0.77 μs，{TETA[PbCl]}为0.39 μs），这是由于光致发光光谱中存在的锰离子的自旋禁戒d-d跃迁（T-A）成分增加。此外，这些锰掺杂的一维LHPPs在潮湿和高温环境中表现出高结构和光学稳定性。因此，此类掺杂材料可制成紫外泵浦的白色发光二极管，在固态照明和显示系统中具有潜在应用。
