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Improving Lead‐Free Double Perovskite Cs2NaBiCl6 Nanocrystal Optical Properties via Ion Doping
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-02-17 , DOI: 10.1002/adom.201901919 Ming‐Ming Yao 1, 2, 3 , Li Wang 4 , Ji‐Song Yao 1, 2 , Kun‐Hua Wang 1, 2 , Chen Chen 2 , Bai‐Sheng Zhu 2 , Jun‐Nan Yang 2 , Jing‐Jing Wang 2 , Wei‐Ping Xu 3 , Qun Zhang 4 , Hong‐Bin Yao 1, 2
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-02-17 , DOI: 10.1002/adom.201901919 Ming‐Ming Yao 1, 2, 3 , Li Wang 4 , Ji‐Song Yao 1, 2 , Kun‐Hua Wang 1, 2 , Chen Chen 2 , Bai‐Sheng Zhu 2 , Jun‐Nan Yang 2 , Jing‐Jing Wang 2 , Wei‐Ping Xu 3 , Qun Zhang 4 , Hong‐Bin Yao 1, 2
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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 Cs2NaBiCl6 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 Cs2NaBiCl6 NCs, the PL of the Cs2NaBiCl6 NCs can be impressively regulated and enhanced via doping Ag+, Mn2+, or Eu3+ 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 Cs2NaBiCl6 NCs. For the Ag+‐doping, the excitonic absorption energy of the Cs2NaBiCl6 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 Mn2+‐doped Cs2NaBiCl6 NCs show broad orange–red emission peak centered at 585 nm with a PLQY of 3%, owing to the 4T1→6A1 transition of octahedrally coordinated Mn2+. Eu3+‐doped Cs2NaBiCl6 NCs are endowed with strong Eu3+5D0→7FJ (J = 1, 2) orange–red emission at 591 and 615 nm.
中文翻译：
通过离子掺杂改善无铅双钙钛矿Cs2NaBiCl6纳米晶体的光学性能
由于卤化钙钛矿形纳米晶的毒性和不稳定性，人们迫切需要探索具有吸引人的光学性能的无铅卤化钙钛矿形纳米晶体（NCs）。在此，据报道，一种新型的均匀无铅双钙钛矿Cs 2 NaBiCl 6 NCs用作容纳离子掺杂剂以改善光学性能（尤其是光致发光（PL））的通用基质。与此相反的低深蓝色PL仅为1.7％所合成的原始Cs的量子产率2 NaBiCl 6个NCS，在Cs的PL 2 NaBiCl 6的NC可以令人印象深刻的调节并通过掺杂的Ag增强+，锰2+或Eu 3+钙钛矿双晶格中的离子。飞秒时间分辨瞬态吸收光谱法用于揭示Cs 2 NaBiCl 6 NC中离子掺杂的PL增强机理。对于Ag +掺杂，可以将Cs 2 NaBiCl 6 NC的激子吸收能从3.82 eV调整到3.48 eV，而PL量子产率（PLQY）从1.7％显着提高到20％。由于4 T 1 → 6 A 1，Mn 2+掺杂的Cs 2 NaBiCl 6 NCs在585 nm处显示出宽的橙红色发射峰，PLQY为3％。八面体配位的Mn 2+的跃迁。Eu 3+掺杂的Cs 2 NaBiCl 6 NC在591和615 nm处具有较强的Eu 3 + 5 D 0 → 7 F J（J = 1，2）橙红色发射。
更新日期：2020-04-21
中文翻译：
通过离子掺杂改善无铅双钙钛矿Cs2NaBiCl6纳米晶体的光学性能
由于卤化钙钛矿形纳米晶的毒性和不稳定性，人们迫切需要探索具有吸引人的光学性能的无铅卤化钙钛矿形纳米晶体（NCs）。在此，据报道，一种新型的均匀无铅双钙钛矿Cs 2 NaBiCl 6 NCs用作容纳离子掺杂剂以改善光学性能（尤其是光致发光（PL））的通用基质。与此相反的低深蓝色PL仅为1.7％所合成的原始Cs的量子产率2 NaBiCl 6个NCS，在Cs的PL 2 NaBiCl 6的NC可以令人印象深刻的调节并通过掺杂的Ag增强+，锰2+或Eu 3+钙钛矿双晶格中的离子。飞秒时间分辨瞬态吸收光谱法用于揭示Cs 2 NaBiCl 6 NC中离子掺杂的PL增强机理。对于Ag +掺杂，可以将Cs 2 NaBiCl 6 NC的激子吸收能从3.82 eV调整到3.48 eV，而PL量子产率（PLQY）从1.7％显着提高到20％。由于4 T 1 → 6 A 1，Mn 2+掺杂的Cs 2 NaBiCl 6 NCs在585 nm处显示出宽的橙红色发射峰，PLQY为3％。八面体配位的Mn 2+的跃迁。Eu 3+掺杂的Cs 2 NaBiCl 6 NC在591和615 nm处具有较强的Eu 3 + 5 D 0 → 7 F J（J = 1，2）橙红色发射。
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