2014
DOI: 10.1021/ja5049412
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Hyperbranched Unsaturated Polyphosphates as a Protective Matrix for Long-Term Photon Upconversion in Air

Abstract: The energy stored in the triplet states of organic molecules, capable of energy transfer via an emissive process (phosphorescence) or a nonemissive process (triplet-triplet transfer), is actively dissipated in the presence of molecular oxygen. The reason is that photoexcited singlet oxygen is highly reactive, so the photoactive molecules in the system are quickly oxidized. Oxidation leads to further loss of efficiency and various undesirable side effects. In this work we have developed a structurally diverse l… Show more

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Cited by 117 publications
(105 citation statements)
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“…129 Finally, matrices which have oxygen-scavenging properties can further reduce the detrimental impact of atmospheric conditions. 152,153 In summary it appears that several complementary strategies for oxygen exclusion and encapsulation are already available. As for the longevity issue discussed above, focussed efforts are needed to explore the feasibility of those approaches in a device context.…”
Section: Encapsulation and Oxygen Defensementioning
confidence: 99%
“…129 Finally, matrices which have oxygen-scavenging properties can further reduce the detrimental impact of atmospheric conditions. 152,153 In summary it appears that several complementary strategies for oxygen exclusion and encapsulation are already available. As for the longevity issue discussed above, focussed efforts are needed to explore the feasibility of those approaches in a device context.…”
Section: Encapsulation and Oxygen Defensementioning
confidence: 99%
“…Consequently, the majority of TTA-UC systems have been studied in solution 8,[11][12][13][14][15] or soft polymer matrices, [16][17][18][19][20] in which the TET and TTA processes are mediated by molecular diffusion and collision. Meanwhile, it is desirable for device applications that TTA-UC processes occur in the solid state without molecular diffusion.…”
Section: Introductionmentioning
confidence: 99%
“…To solve this issue, we and others recently showed that antioxidants such as L-histidine, ascorbic acid, or glutathione, can protect TTA-UC against oxygen: upon irradiation of TTA-UC vesicles in air, the photosensitizer initially generates singlet oxygen, which is scavenged by the antioxidant until all oxygen in the irradiated volume has been consumed ( Figure 1b) [25,[34][35][36][37]. Once the O 2 concentration reaches a certain threshold, TTA-UC switches on and remains stable for minutes to even hours in spite of the air atmosphere.…”
Section: Introductionmentioning
confidence: 99%