식물성 오일에서 구현되는 삼중항-삼중항 소멸법에 의한 Upconversion 분석 = Efficient Triplet-triplet Annihilation-based Upconversion in Vegetable Oils

다국어 초록 (Multilingual Abstract)

We herein report efficient triplet-triplet annihilation upconversion (TTA-UC) achieved in various non-toxic and non-volatile vegetable oils as a UC media using platinum-octaethylporphyrin (PtOEP) and 9,10-diphenylanthracene (DPA) as a sensitizer and acceptor, respectively. Green-to-blue UC was readily achieved from PtOEP/DPA solution in vegetable oils with the quan-tum yield of 8% without any deoxygenation process. The UC efficiency was found to be significantly dependent on the con-tents of unsaturated hydrocarbon in vegetable oils and viscosity of the solution, as well. Though the Stern-volmer constant and quantum yield in vegetable oils were measured to be lower than those measured in the deaerated organic solvent, the quenching efficiency was still high enough to be 93%. In the sunflower oil, the UC threshold intensity (I_th) was approx. 100 mW/cm², which is far larger than the sunlight intensity, but we believe that the UC achieved in non-toxic and air-saturated media was still highly applicable to nontraditional visualization techniques such as bioimaging.

참고문헌 (Reference)

1 W. Zhao, "Upconverted emission from pyrene and di-tert-butylpyrene using Ir(ppy)3 as triplet sensitizer" 110 : 11440-11445, 2006

2 J. H. Kim, "Triple-emulsion microcapsules for highly efficient multispectral upconversion in the aqueous phase" 2 : 633-638, 2015

3 T. N. Singh-Rachford, "Photon upconversion based on sensitized triplet-triplet annihilation" 254 : 2560-2573, 2010

4 T. F. Schulze, "Photochemical upconversion:present status and prospects for its application to solar energy conversion" 8 : 103-125, 2015

5 M. Penconi, "New molecular pairs for low power non-coherent triplet-triplet annihilation based upconversion: dependence on the triplet energies of sensitizer and emitter" 135 : 265-270, 2013

6 P. B. Merkel, "Low-power green-to-blue and blue-to-UV upconversion in rigid polymer films" 129 : 303-306, 2009

7 R. R. Islangulov, "Low power upconversion using MLCT sensitizers" 30 : 3776-3778, 2005

8 T. Ogawa, "Highly efficient photon upconversion in self-assembled light-harvesting molecular systems" 5 : 10882-, 2015

9 A. Monguzzi, "High efficiency up-converting single phase elastomers for photon managing applications" 3 : 680-686, 2013

10 J. H. Kim, "High efficiency low-power upconverting soft materials" 24 : 2250-2252, 2012

11 J. H. Kim, "Encapsulated triplet-triplet annihilation-based upconversion in the aqueous phase for sub-band-gap semiconductor photocatalysis" 134 : 17478-17481, 2012

12 T. F. Schulze, "Efficiency enhancement of organic and thin-film silicon solar cells with photochemical upconversion" 116 : 22794-22801, 2012

13 J. Peng, "Developing efficient heavy-atom-free photosensitizers applicable to TTA upconversion in polymer films" 7 : 1233-1237, 2016

14 T. N. Singh-Rachford, "Boron dipyrromethene chromophores: next generation triplet acceptors/annihilators for low power upconversion schemes" 130 : 16164-16165, 2008

15 Q. Liu, "A general strategy for biocompatible, high-effective upconversion nanocapsules based on triplet-triplet annihilation" 135 : 5029-5037, 2013