Energy-Transfer in CsPbBr_(3) Nanocrystals:Sensitization of Porphyrin Triplets  

CsPbBr_(3)纳米晶敏化叶啉三线态的能量转移机制研究

作　　者：Yinjie Lu Zongwei Chen 卢尹洁;陈宗威(郑州大学河南先进技术研究院,郑州450052)

机构地区：[1]Henan Institute of Advanced Technology,Zhengzhou University,Zhengzhou 450052,China

出　　处：《Chinese Journal of Chemical Physics》2024年第5期632-637,I0059-I0062,I0100,共11页化学物理学报（英文）

基　　金：This work is supported by the National Natural Science Foundation of China(No.21803070).

摘　　要：Sensitizing molecular triplets by colloidal nanocrystals via triplet energy transfer is important for applications such as upconversion or organic synthesis.Typically two step triplet energy transfer(TET)are included in these applications:firstly the triplet energy stored in nanocrystals are extracted into surface ligands,and then the ligands further transfer triplet energy into molecules in bulk solution.Here we report one-step TET application from CsPbBr_(3) perovskite nanocrystals(NCs)to surface-anchored metalloporphyrin derivative molecules(MP).Compared to conventional two-step TET,the one-step TET mechanism possess lower energy loss and higher TET efficiency which is more generally implementable.In this scheme,photoexcitation of CsPbBr_(3)NCs leads to the sensitization of MP ligands triplets which efficiently emit phosphorescence.The enhanced light absorption of MP ligands and down-shifted photon emission can be useful in devices such as luminescent solar concentrators.从胶体纳米晶体到分子的三线态能量转移是一种敏化分子三线态的新方法,这种新的三线态产生方式对于许多应用诸如三线态融合上转换、单线态氧生成和有机光合成非常重要通常在这些应用中需要两步三线态能量转移过程:首先将存储在纳米晶体中的三线态能量提取到表面配体中,然后配体进一步将三线态能量传递给溶液中的分子:本文报道了一步三线态能量转移的应用,即从CsPbBr_(3)钙钛矿纳米晶体到表面锚定金属卧啉衍生物分子的三线态能量转移与传统的两步三线态能量转移相比,一步的三线态能量转移机制具有更低的能量损失和更高的能量转移效率,更易实施,在这个方案中,CsPbBr_(3)纳米晶体的光激发导致叶啉配体的三线态敏化,从而有效地发射磷光光子。因此,卧啉分子的光吸收被大大增强,并且光子的发射波长相比于吸收波长可以产生更大的斯托克斯位移。这种新型的能量转换方案可能在荧光太阳聚光板等器件中展示潜在的应用价值。

关 键 词：Triplet energy transfer CsPbBr_(3)nanocrystal Metalloporphyrin derivative Luminescent solar concentrators 

分 类 号：O62[理学—有机化学]