Triplet-Triplet Annihilation-Based Anti-Stokes Oxygen Sensing Materials with a Very Broad Dynamic Range
Triplet-Triplet Annihilation-Based Anti-Stokes Oxygen Sensing Materials with a Very Broad Dynamic Range
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DOI：
10.1002/adfm.201200794
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发表时间：
2012-10-23
影响因子：
19
通讯作者：
Klimant, Ingo
中科院分区：
文献类型：
--
作者：
Borisov, Sergey M.;Larndorfer, Christoph;Klimant, Ingo
提出了一种设计光氧传感材料的新概念。氧敏感的反斯托克斯发射是通过基于三重态湮灭的上转换产生的，并作为分析参数。多孔玻璃微珠用于掺入传感化学物质，包括溶解在高沸点溶剂中的敏化剂和湮灭剂。这些珠子被分散在硅橡胶或聚四氟乙烯AF中，以生产固态光电器件。廉价的低功率光源（led）用于激发。上转换发射对发光衰减时间和发光强度都具有无与伦比的灵敏度。后者的特征是不寻常的二次斯特恩-沃尔默图。敏化剂残余近红外发光的灵敏度低得多，可以在从微量氧量到类似于40 kPa的宽动态范围内测定pO2。演示了传感器在频域的问询。研究了激发光功率对传感材料的校准、温度效应、改变pO2的动态响应和光稳定性的影响。
A novel concept for designing optical oxygen sensing materials is reported. Oxygen-sensitive anti-Stokes emission is generated via triplettriplet annihilation-based upconversion and serves as an analytical parameter. Porous glass beads are used to incorporate the sensing chemistry including a sensitizer and an annihilator dissolved in a high boiling solvent. The beads are dispersed in silicone rubber or Teflon AF to produce solid state optodes. Inexpensive low power light sources (LEDs) are used for the excitation. The upconverted emission shows unmatched sensitivity both for the luminescence decay time and for the luminescence intensity. The latter features unusual quadratic Stern-Volmer plots. Much lower sensitivity of the residual NIR luminescence of the sensitizer allows determination of pO2 in the broad dynamic range from trace oxygen quantities to similar to 40 kPa. Interrogation of the sensors in frequency domain is demonstrated. Influence of the excitation light power on the calibration, temperature effects, dynamic response to altering pO2, and photostability of the sensing materials are also investigated.