Photochemical upconversion is suppressed by high concentrations of molecular sensitizers†,Physical Chemistry Chemical Physics

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Photochemical upconversion is suppressed by high concentrations of molecular sensitizers†
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2018-07-03 00:00:00 , DOI: 10.1039/c8cp02650e
Elham M. Gholizadeh _{1,

2,

3,

4,

5} , Laszlo Frazer _{1,

2,

3,

4,

5} , Rowan W. MacQueen _{1,

2,

3,

4,

5} , Joseph K. Gallaher _{1,

2,

3,

4,

5} , Timothy W. Schmidt _{1,

2,

3,

4,

5}

Affiliation

Photochemical upconversion uses sensitized triplet–triplet annihilation in bimolecular compositions to convert lower energy photons to higher energy photons. For high efficiency under low illumination, usually a high sensitizer concentration is desirable. However, here we show that the upconversion sensitizer can reduce the emitter triplet lifetime by dynamic quenching, with rate constants on the order 10⁶ M⁻¹ s⁻¹, leading to diminishing returns beyond a certain concentration. These results serve as a warning to designers of photochemical upconvertors that higher concentrations of sensitizers are not necessarily beneficial to upconversion performance.

中文翻译：

高浓度的分子敏化剂可抑制光化学上转换†

光化学上转换在双分子组合物中使用敏化的三重态-三重态an灭将低能光子转换为高能光子。为了在低照明下实现高效率，通常需要高敏化剂浓度。但是，在此我们表明，上转换敏化剂可通过动态猝灭来降低发射极三重态的寿命，速率常数约为10 ⁶ M ^-1 s ^-1，导致超过一定浓度的反射率递减。这些结果向光化学上变频器的设计者发出警告，即更高浓度的敏化剂不一定对上变频性能有利。

更新日期：2018-07-03

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