纳米晶
材料科学
量子产额
离子
钙钛矿(结构)
掺杂剂
兴奋剂
卤化物
量子点
光电子学
光致发光
纳米技术
分析化学(期刊)
结晶学
无机化学
光学
化学
荧光
有机化学
物理
色谱法
作者
Mingming Yao,Li Wang,Jisong Yao,Kunhua Wang,Chen Chen,Bai‐Sheng Zhu,Jun‐Nan Yang,Jing‐Jing Wang,Weiping Xu,Qun Zhang,Hong‐Bin Yao
标识
DOI:10.1002/adom.201901919
摘要
Abstract The exploration of lead‐free halide perovskite nanocrystals (NCs) with intriguing optical properties is highly desirable owing to the toxicity and instability of lead halide perovskite NCs. Here, a new kind of uniform lead‐free double perovskite Cs 2 NaBiCl 6 NCs are reported as versatile hosts to accommodate ionic dopants for improving optical properties especially the photoluminescence (PL). In contrast to the low deep‐blue PL with a quantum yield of only 1.7% of the as‐synthesized pristine Cs 2 NaBiCl 6 NCs, the PL of the Cs 2 NaBiCl 6 NCs can be impressively regulated and enhanced via doping Ag + , Mn 2+ , or Eu 3+ ions in the double perovskite lattices. The femtosecond time‐resolved transient absorption spectroscopy is adopted to unravel the PL enhancement mechanism of the ion doping in the Cs 2 NaBiCl 6 NCs. For the Ag + ‐doping, the excitonic absorption energy of the Cs 2 NaBiCl 6 NCs can be tuned from 3.82 to 3.48 eV with the significant improvement of the PL quantum yield (PLQY) from 1.7% to 20%. The Mn 2+ ‐doped Cs 2 NaBiCl 6 NCs show broad orange–red emission peak centered at 585 nm with a PLQY of 3%, owing to the 4 T 1 → 6 A 1 transition of octahedrally coordinated Mn 2+ . Eu 3+ ‐doped Cs 2 NaBiCl 6 NCs are endowed with strong Eu 3+5 D 0 → 7 F J ( J = 1, 2) orange–red emission at 591 and 615 nm.
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