Photoluminescence quantum efficiency (PLQE) and PL decay characteristics of polymeric light emitting materials |
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| Affiliation: | 1. Samtel Centre for Display Technologies, Indian Institute of Technology, Kanpur 16, India;2. Materials Science Programme, Indian Institute of Technology, Kanpur 16, India;3. Department of Physics, Indian Institute of Technology, Kanpur 16, India;1. Thüringisches Institut für Textil- und Kunststoff-Forschung e.V., Breitscheidstraße 97, 07407 Rudolstadt, Germany;2. POLY-CHEM AG, Chemiepark Bitterfeld-Wolfen, Areal B, Farbenstraße, 06803 Greppin, Germany;1. Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain;2. GMF, Institute of Chemical Sciences and Engineering, EPFL Valais, Rue de L''Industrie, 1951 Sion, Switzerland;3. Department of Physics, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran;4. Humboldt-Universität zu Berlin, Institut für Physik & IRIS Adlershof, Berlin, Germany;5. Helmholtz-Zentrum Berlin für Materialien und Energie, Division Renewable Energies, Berlin, Germany;6. Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, PO Box 80203, Jeddah 21589, Saudi Arabia;1. Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea;2. Research Institute of Advanced Materials, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea;3. BK21 PLUS SNU Materials Division for Educating Creative Global Leaders, Seoul National University, 1 Gwanak-ro , Gwanak-gu, Seoul 08826, Republic of Korea;4. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 790-784, Republic of Korea;5. Advance Nano Research Group, Korea Basic Science Institute (KBSI), 169-148 Gwahak-ro, Daejeon 34133, Republic of Korea;6. Department of Chemical and Biological Engineering, Sookmyung Women''s University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul 04310, Republic of Korea;1. College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, China;2. State Centre for International Cooperation on Designer Low-carbon & Environmental Materials, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;3. School of Physics and Electronics, Henan University, Kaifeng 475004, China;1. Laboratory of Photomolecular Science, Institute of Chemical Sciences Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland;2. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland |
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| Abstract: | We report photoluminescence quantum efficiency (PLQE) measurements on thin films of a variety of in-house synthesized conjugated polymers such as PPV, MEH-PPV and CN-PPV with improved techniques using integrating sphere and synchronous detection. Our method allows use of low level of excitation avoiding problems due to degradation during measurement. Time correlated single photon counting (TCSPC) has been used to study PL decay to obtain radiative lifetime controlling efficiency in these materials. The measured PL efficiency in PPV synthesized by xanthate precursor route is measured to be 0.07 ± 0.01, which is lower than reported for similar films owing to presence of intrinsic defects. The measured PL quantum efficiency of CN-PPV and MEH-PPV are 0.24 ± 0.07 and 0.17 ± 0.01, respectively. These values are comparable to the ones reported by others N.C. Greenham, I.D. Samuel, G.R. Hayes, R.T. Phillips, Y.A.R.R. Kessener, S.C. Moratti, A.B. Holmes, R.H. Friend, Chem. Phys. Lett. 89 (1995) 241]. We suggest a reliable method of obtaining the radiative lifetime from PL decay curves using time domain spectroscopic technique. |
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