(Invited) Upconverted Emission in AC-Driven Electrochemiluminescent Device

Abstract

Electrochemiluminescence (ECL) is a phenomenon in which light is emitted from the excited state of a redox-active material generated by electrochemical reactions. Among light-emitting device, ECL devices have various advantages in terms of structure and simple fabrication, and they are therefore expected as next generation emitting devices.Concerning to the ECL device, we have reported the improvement of emission response, ECL intensity and stability of the ECL device by employing alternating current (AC)-driven method [1, 2]. AC-ECL showed further improvement in ECL properties when TiO2 nanoparticles [3], suitable solvent [4] and DNA/Ru complex hybrid films were used [5] In this paper, we report that electrochemically triggered upconverted luminescence through triplet–triplet energy transfer (TTET) and subsequent triplet–triplet annihilation upconversion (TTA-UC) is observed for the first time in the electrochemiluminescence properties of a Ru complex/diphenylantracene (DPA) containing electrochemical device [6]. This mechanism will be discussed. Reference [1]. T. Nobeshima, T. Morimoto, K. Nakamura, N. Kobayashi, J. Mater. Chem., 20, 10630 (2010) [2]. T. Nobeshima, M. Nakakomi, K. Nakamura and N. Kobayashi, Adv. Opt. Mater., 1, 144 (2013) [3]. S. Tsuneyasu, K. Ichihara, K. Nakamura and N. Kobayashi, Phys. Chem. Chem. Phys., 18, 16317 (2016) [4]. S. Tsuneyasu, T. Ichikawa, K. Nakamura and N. Kobayashi, ChemElectroChem, 4, 1731 (2017) [5]. S. Tsuneyasu, R. Takahashi, H. Minami, K. Nakamura and N. Kobayashi, Sci. Report, 7, 8525 (2017) [6]. H. Minami, T. Ichikawa, K. Nakamura and N. Kobayashi, Chem. Commun., 55, 12611 (2019)