Structural,optical and electrical properties of europium picrate tetraethylene glycol complex as emissive material for OLED |
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Authors: | Eny Kusrini Muhammad I Saleh Rohana Adnan Yoki Yulizar Ng Sha Shiong HK Fun MA Adhha Abdullah Mazidah Mamat NK Za’aba WH Abd Majid |
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Institution: | 1. Department of Chemical Engineering, Faculty of Engineering, Universitas Indonesia, 16424 Depok, Indonesia;2. School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia;3. Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, 16424 Depok, Indonesia;4. School of Physics, Universiti Sains Malaysia, 11800 Penang, Malaysia;5. Department of Chemical Sciences, Faculty of Science and Technology, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu Darul Iman, Malaysia;6. Solid State Research Laboratory, Department of Physics, Universiti Malaya, 50603 Kuala Lumpur, Malaysia |
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Abstract: | A new europium complex Eu(Pic)2(H2O)(EO4)](Pic)·0.75H2O was synthesized and used as the emission material for the single layer device structure of ITO/EO4–Eu–Pic/Al, using a spin-coating technique. Study on the optical properties of the Eu(Pic)2(H2O)(EO4)](Pic)·0.75H2O complex where EO4=tetraethylene glycol and Pic=picrate anion, had to be undertaken before being applicable to the study of an organic light emitting diode (OLED). The electrical property of an OLED using current–voltage (I–V) measurement was also studied. In complex, the Eu(III) ion was coordinated with the EO4 ligand as a pentadentate mode, one water molecule, and with two Pic anions as bidentate and monodentate modes, forming a nine-coordination number. The photoluminescence (PL) spectra of the crystalline complex in the solid state and its thin film showed a hypersensitive peak at 613.5–614.9 nm that assigned to the 5D0→7F2 transition. A narrow band emission from the thin film EO4–Eu–Pic was obtained. The typical semiconductor I–V curve of device ITO/EO4–Eu–Pic/Al showed the threshold and turn on voltages at 1.08 and 4.6 V, respectively. The energy transfer process from the ligand to the Eu(III) ion was discussed by investigating the excitation and PL characteristics. Effect of the picrate anion on the device performance was also studied. |
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