Green exciplex emission from a bilayer light-emitting diode containing a rare earth ternary complex |
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| Affiliation: | 1. Department of Physics and Astronomy, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia;2. Research Chair on Laser Diagnosis of Cancers, Department of Physics and Astronomy, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia;1. Univ. Grenoble Alpes, INAC-SCIB, F-38000 Grenoble, France;2. CEA, INAC-SCIB, F-38000 Grenoble, France;3. Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, Montpellier, F-France;4. Univ. Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France;5. CEA, INAC-SPSMS, F-38000 Grenoble, France;6. Univ. Grenoble Alpes, INAC-SP2M, F-38000 Grenoble, France;7. CEA, INAC-SP2M, F-38000 Grenoble, France;8. Univ. Grenoble Alpes, F-38000 Grenoble, France;9. CEA, LETI, MINATEC Campus, 17 rue des Martyrs, F-38054 Grenoble, France;1. INESC – Microsistemas e Nanotecnologias, Lisboa, Portugal;2. Instituto Superior Tecnico (IST), Universidade de Lisboa, Lisboa, Portugal;3. Fraunhofer Institute for Photonic Microsystems IPMS, 01099 Dresden, Germany;4. Singulus Technologies AG, 63796 Kahl am Main, Germany;1. School of Natural Science, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, South Korea;2. Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, UK;3. Division of Physics and Semiconductor Science, Dongguk University, Seoul, 04620, South Korea |
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| Abstract: | A bilayer organic light-emitting diode using a blue-fluorescent yttrium complex, tris(1-phenyl-3-methyl-4-isobutyryl-5-pyrazolone)-(2,2′-dipyridyl) yttrium [Y(PMIP)3(Bipy)] (YPB) as an emitting material and poly(N-vinylcarbazole) (PVK) as a hole-transporting material emitted bright green light instead of blue light. It was attributed to the exciplex formation at the solid interface between the PVK and YPB layers, which was demonstrated by the measurement of the absorption, photoluminescence (PL) and photoluminescence excitation (PLE) spectra of the mixture of PVK and YPB (molar ratio 1:1). The device exhibited a maximum luminance of 177 cd/m2 and a peak power efficiency of 0.02 lm/W. |
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