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Chemically Addressable Perovskite Nanocrystals for Light‐Emitting Applications
Advanced Materials ( IF 27.4 ) Pub Date : 2017-07-10 , DOI: 10.1002/adma.201701153 Haizhu Sun 1, 2 , Zhenyu Yang 3 , Mingyang Wei 3 , Wei Sun 1 , Xiyan Li 3 , Shuyang Ye 1 , Yongbiao Zhao 3, 4 , Hairen Tan 3 , Emily L. Kynaston 1 , Tyler B. Schon 1 , Han Yan 1 , Zheng-Hong Lu 4 , Geoffrey A. Ozin 1 , Edward H. Sargent 3 , Dwight S. Seferos 1
Advanced Materials ( IF 27.4 ) Pub Date : 2017-07-10 , DOI: 10.1002/adma.201701153 Haizhu Sun 1, 2 , Zhenyu Yang 3 , Mingyang Wei 3 , Wei Sun 1 , Xiyan Li 3 , Shuyang Ye 1 , Yongbiao Zhao 3, 4 , Hairen Tan 3 , Emily L. Kynaston 1 , Tyler B. Schon 1 , Han Yan 1 , Zheng-Hong Lu 4 , Geoffrey A. Ozin 1 , Edward H. Sargent 3 , Dwight S. Seferos 1
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Whereas organic–inorganic hybrid perovskite nanocrystals (PNCs) have remarkable potential in the development of optoelectronic materials, their relatively poor chemical and colloidal stability undermines their performance in optoelectronic devices. Herein, this issue is addressed by passivating PNCs with a class of chemically addressable ligands. The robust ligands effectively protect the PNC surfaces, enhance PNC solution processability, and can be chemically addressed by thermally induced crosslinking or radical‐induced polymerization. This thin polymer shield further enhances the photoluminescence quantum yields by removing surface trap states. Crosslinked methylammonium lead bromide (MAPbBr3) PNCs are applied as active materials to build light‐emitting diodes that have low turn‐on voltages and achieve a record luminance of over 7000 cd m−2, around threefold better than previous reported MA‐based PNC devices. These results indicate the great potential of this ligand passivation approach for long lifespan, highly efficient PNC light emitters.
中文翻译：
用于发光应用的可化学寻址的钙钛矿纳米晶体
有机-无机杂化钙钛矿纳米晶体（PNC）在光电子材料的发展中具有巨大潜力，而其相对较差的化学和胶体稳定性却破坏了它们在光电子器件中的性能。本文中，通过用一类可化学寻址的配体钝化PNC来解决此问题。坚固的配体可有效保护PNC表面，增强PNC溶液的可加工性，并可通过热诱导交联或自由基引发的聚合反应进行化学处理。这种薄的聚合物屏蔽层通过去除表面陷阱态进一步提高了光致发光量子产率。交联的甲基铵溴化铅（MAPbBr 3）PNC被用作活性材料来制造具有低导通电压并达到7000 cd m -2的创纪录亮度的发光二极管，约为以前报道的基于MA的PNC器件的三倍。这些结果表明，这种配体钝化方法对于长寿命，高效的PNC发光体具有巨大的潜力。
更新日期：2017-07-10
中文翻译：
用于发光应用的可化学寻址的钙钛矿纳米晶体
有机-无机杂化钙钛矿纳米晶体（PNC）在光电子材料的发展中具有巨大潜力，而其相对较差的化学和胶体稳定性却破坏了它们在光电子器件中的性能。本文中，通过用一类可化学寻址的配体钝化PNC来解决此问题。坚固的配体可有效保护PNC表面，增强PNC溶液的可加工性，并可通过热诱导交联或自由基引发的聚合反应进行化学处理。这种薄的聚合物屏蔽层通过去除表面陷阱态进一步提高了光致发光量子产率。交联的甲基铵溴化铅（MAPbBr 3）PNC被用作活性材料来制造具有低导通电压并达到7000 cd m -2的创纪录亮度的发光二极管，约为以前报道的基于MA的PNC器件的三倍。这些结果表明，这种配体钝化方法对于长寿命，高效的PNC发光体具有巨大的潜力。
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