1. Low-power photon upconversion in organic glasses
- Author
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Christoph Weder, Yoan C. Simon, and Roberto Vadrucci
- Subjects
Anthracene ,Materials science ,business.industry ,Orders of magnitude (temperature) ,02 engineering and technology ,General Chemistry ,Radiation ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,Ray ,Photon upconversion ,0104 chemical sciences ,law.invention ,Light intensity ,chemistry.chemical_compound ,chemistry ,law ,Materials Chemistry ,Optoelectronics ,Crystallization ,0210 nano-technology ,business ,Common emitter - Abstract
Green-to-blue upconverting molecular glasses consisting of a metal octaethylporphyrin (MOEP, M = Pd, Pt) sensitizer and 9-(4-hydroxymethylphenyl)-10-phenyl anthracene (DPA-CH2OH) as an emitter are reported. In these materials, incident light is transformed into higher-energy radiation by way of triplet–triplet annihilation upconversion. The DPA-CH2OH–MOEP mixtures form transparent glasses when cooled from the thermally stable melt, even at rates as low as 1 °C min−1. In a systematic study, the PdOEP concentration was varied from 0.025 to 6.6 mol%. The normalized upconverted light intensity decreased with increasing sensitizer concentration by almost three orders of magnitude, as a result of sensitizer aggregation. The upconverted light intensity also decreased upon deliberate crystallization of the upconverting materials. Beyond demonstrating the first embodiment of upconversion in molecular glasses, the results highlight the importance of morphology control in solid-state upconverting materials.
- Published
- 2014
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