Efficient Triplet Sensitizers of Palladium(II) Tetraphenylporphyrins for Upconversion-Powered Photoelectrochemistry

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• 作者：Bao Wang ; Bin Sun ; Xiaomei Wang ; Changqing Ye ; Ping Ding ; Zuoqin Liang ; Zhigang Chen ; Xutang Tao ; Lizhu Wu
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：January 23, 2014
• 年：2014
• 卷：118
• 期：3
• 页码：1417-1425
• 全文大小：578K
• ISSN：1932-7455

文摘

The positive external heavy atom effect on upconversion efficiency (桅_uc) of DPA (9,10-diphenylanthracene) emitter combined with palladium(II)tetraphenylporphyrins as triplet sensitizer was first found to significantly increase from 12.33% to 35.17% under excitation of low power density at 30 mW路cm^鈥? (位_ex = 532 nm). Dynamics data showed that the increasing phosphorescence lifetime (蟿_p) and the phosphorescence quantum yield (桅_p) of sensitizer, accompanied with the decreasing nonphosphorescence decay rate constant (k_np), have contribution to the triplet鈥搕riplet energy transfer (TTT). Interestingly, the external heavy atom effect was found to be more efficient than the internal heavy atom effect on upconversion efficiency, which has provided a simple approach to increase low-powered upconversion efficiency without the difficulties that can arise by the modification of the sensitizer molecular structure in its inner parts. Moreover, this efficient green-to-blue upconversion has been demonstrated to have potential application for the hydrogen-generation from water under excitation of sun energy.