Arunkumar Paulraj, Gil Kyeong Hun, Won Seob, Unithrattil Sanjith, Kim Yoon Hwa, Kim Ha Jun, Im Won Bin
School of Materials Science and Engineering and Optoelectronic Convergence Research Center, Chonnam National University , 77, Yongbong-ro, Buk-Gu, Gwangju 61186, Republic of Korea.
J Phys Chem Lett. 2017 Sep 7;8(17):4161-4166. doi: 10.1021/acs.jpclett.7b01440. Epub 2017 Aug 21.
Organolead halide perovskites have emerged as a promising optoelectronic material for lighting due to its high quantum yield, color-tunable, and narrow emission. Despite their unique properties, toxicity has intensified the search for ecofriendly alternatives through partial or complete replacement of lead. Herein, we report a room-temperature synthesized Mn-substituted 3D-organolead perovskite displacing ∼90% of lead, simultaneously retaining its unique excitonic emission, with an additional orange emission of Mn via energy transfer. A high Mn solubility limit of 90% was attained for the first time in lead halide perovskites, facilitated by the flexible organic cation (CHNH) network, preserving the perovskite structure. The emission intensities of the exciton and Mn were influenced by the halide identity that regulates the energy transfer to Mn. Homogeneous emission and electron spin resonance characteristics of Mn indicate a uniform distribution of Mn. These results suggest that low-toxicity 3D-CHNHPbMnBrCl nanocrystals may be exploited as magnetically doped quantum dots with unique optoelectronic properties.
有机卤化铅钙钛矿因其高量子产率、颜色可调且发射窄等特性，已成为一种有前景的用于照明的光电子材料。尽管它们具有独特的性能，但毒性促使人们通过部分或完全替代铅来寻找环保替代品。在此，我们报道了一种室温合成的锰取代的3D有机铅钙钛矿，其取代了约90%的铅，同时保留了其独特的激子发射，并通过能量转移产生额外的锰橙色发射。通过柔性有机阳离子(CHNH)网络的作用，首次在卤化铅钙钛矿中实现了90%的高锰溶解度极限，从而保留了钙钛矿结构。激子和锰的发射强度受调节向锰能量转移的卤化物种类影响。锰的均匀发射和电子自旋共振特性表明锰分布均匀。这些结果表明，低毒性的3D-CHNHPbMnBrCl纳米晶体可被用作具有独特光电子特性的磁掺杂量子点。
