Structural, Optical and Decay Properties of Zinc(II) 8-Hydroxyquinoline and Its Thin Film
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https://doi.org/10.1007/s11664-020-08255-y 2020 The Minerals, Metals & Materials Society
Structural, Optical and Decay Properties of Zinc(II) 8-Hydroxyquinoline and Its Thin Film DEEPSHIKHA PAINULY,1 R. SINGHAL,2 P. KANDWAL,3 and I.M. NAGPURE1,4 1.—Department of Physics, National Institute of Technology, Uttarakhand 246174, India. 2.—Department of Physics and Materials Research Centre, Malaviya National Institute of Technology, Jaipur 302017, India. 3.—Department of Chemistry, National Institute of Technology, Uttarakhand 246174, India. 4.—e-mail: [email protected]
Zinc(II) 8-hydroxyquinoline (Znq2) green luminescent material and its blended thin film in a poly(methyl methacrylate) (PMMA) matrix have been prepared. XRD analysis confirms the formation of the compound and its presence in the PMMA blended thin film. The orbital molecular geometry, quantum chemical calculations and band gap energy of Znq2 phosphor have been confirmed from the DFT study. The morphology of the phosphor was shown by the SEM images. UV–Vis absorption, photoluminescence and decay analysis of zinc(II) 8-hydroxyquinoline phosphor confirms its suitability as a green emitter for organic light-emitting diodes. Uniform distribution of Znq2 powder in the PMMA matrix and its roughness was estimated by AFM analysis. Luminescence decay study was utilized to demonstrate its lifetime analysis by the time-correlated single-photon counting (TCSPC) system. Key words: Organic light-emitting diode (OLED), photoluminescence (PL), poly(methyl methacrylate) (PMMA), Zn(II) bis(8-hydroxyquinoline)
INTRODUCTION Energy-saving materials play an important role in designing portable light-emitting diodes, such as organic light-emitting diodes (OLEDs).1 OLEDs are extensively used as portable electronic devices due to their self-emitting nature, as they are thin and lightweight compared to liquid crystal displays (LCD) and have desirable properties.1,2 The performance of electronic OLED devices is still challenging in terms of high luminescence and thermal stability. Thus, it is very interesting to explore materials having better thermal stability and prominent luminescence features which are utilized to develop faster and brighter electroluminescent devices.2,3 The guest-modulated chromogenic and fluorescence behavior of 8-hydroxyquinoline and its derivatives generally make more interesting
(Received July 24, 2019; accepted June 3, 2020)
phosphor than EDTA and its derivatives for OLED applications.4,5 Among all Mqn metal chelates (i.e. Liq, Caq2, Mnq2, Znq2, Alq3, Biq3, and Irq3), Znq2 (zinc(II) 8-hydroxyquinoline) is a prominent candidate to improve the electron transport properties, quantum yield, and luminescence features of OLEDs.6–10 Detailed investigations of structural effects in the Znq2 phosphor on its optical properties and effectiveness of OLED also have been reported earlier.11,12 Recent reports indicate that Znq2 shows better luminescence efficiency and high quantum yield at low operating voltage as compared to the Alq.13,14 Therefore, 8-hy
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