关于举行印度科学教育与研究学院Angshuman Nag教授学术报告会的通知

2022-12-01 630

报告题目Moving the Goalposts from Pb-Free Halide Perovskites to their Doping

   Angshuman Nag教授Indian Institute of Science Education and Research (IISER), Pune

报告时间2022121日(周四)下午16:30-18:30

报告地点 腾讯会议 571-830-440

会议直播网址https://meeting.tencent.com/dm/FcRHE1ffWlAv#

 

发光材料与器件国家重点实验室

2022121

 

报告摘要Lead (Pb) halide based perovskites show outstanding optoelectronic properties. But Pb-toxicity remains an issue for their widespread application. For example, Pb content in electronic products is restricted to 0.1 wt% by the European Union guidelines. Therefore, search for Pb-free metal halide perovskites is natural. The fundamental question is how to identify alternative metal halides that could replicate optoelectronic properties of the Pb-halide perovskites.1,2 I will address this question in the first part of my talk. Unfortunately, till date, Pb-free perovskites could not compete with optoelectronic properties Pb-halide perovskites. Why so? This question will also be discussed in me talk. Finally, in the last 2-3 years, we moved the goalposts of our research. Instead of attempting to replicate the optoelectronic properties of Pb-halide perovskites, we started to explore newer directions. For example, we dope lanthanides like Yb and Er in Cs2AgInCl6 double perovskites to develop short-wave-infrared (SWIR) light emitting materials.3,4 Furthermore, doping and/or codoping ions like Bi3+ and Sb3+ (that has two electrons in the outermost s-orbiatl) tailor both optical excitation and emission in the UV-visible region.5,6 In the last part of my talk, I will discuss about such exploration. 

 

References:

1. Pal, J.; Manna, S.; Mondal, A.; Das, S.; Adarsh, K. V.; Nag, A. Colloidal Synthesis and Photophysics of M3Sb2I9 (M = Cs and Rb) Nanocrystals: Lead-Free Perovskites. Angew Chem. Int. Ed. 2017, 56, 14187

2. Mir, W. J.; Warankar, A.; Acharya, A.; Mandal, P.; Nag, A. Colloidal Thallium Halide Nanocrystals with Reasonable Luminescence, Carrier Mobility and Diffusion Length. Chem. Sci. 20178, 4602

3. Arfin, H.; Kaur, J.; Sheikh, T.; Chakraborty, S.; Nag, A. Bi3+‐Er3+ and Bi3+‐Yb3+ Codoped Cs2AgInCl6 Double Perovskite Near Infrared Emitters. Angew. Chem. Int. Ed. 202059, 11307

4. Saikia, S.; Joshi, A.; Arfin, H.; Badola, S.; Saha, S; Nag, A. Sb3+–Er3+-Codoped Cs2NaInCl6 for Emitting Blue and Short-Wave Infrared Radiation. Angew. Chem. Int. Ed. 202261, e20220162

5. Arfin, H.; Kshirsagar, A. S.; Kaur, J.; Mondal, B.; Xia, Z.; Chakraborty, S.; Nag, A. ns2 Electron (Bi3+ and Sb3+) Doping in Lead-Free Metal Halide Perovskite Derivatives. Chem. Mater. 2020, 32, 24, 10255

6. Arfin, H.; Nag, A. Origin of Luminescence in Sb3+- and Bi3+-Doped Cs2SnCl6 Perovskites: Excited State Relaxation and Spin−Orbit Coupling. J. Phys. Chem. Lett. 202112, 10002.

 

 

报告人简介Angshuman Nag副教授任职于印度科学教育与研究学院-普纳,化学系,硕士和博士学位分别在印度科学教育与研究学院古瓦哈提、班加罗尔获得,并曾在芝加哥大学从事博士后研究。Angshuman Nag博士长期从事半导体发光材料电子结构与发光性能研究,在钙钛矿发光材料,特别是近年来低维和无铅钙钛矿发光材料研究领域做出了重要成绩,发表了系列高水平研究论文。曾获得了2020年印度材料研究学会奖章,并担任了Nano Letters, Chemistry of Materials ChemistrySelect期刊的国际编委。


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