Probing on phase dependent luminescent properties of Al2O3 nanowires for their performance in ferroelectric liquid crystal. (29th July 2015)

• Record Type: Journal Article
• Authors: Gangwar, Jitendra; Chandran, Achu; Joshi, Tilak; Verma, Rajni; Biradar, Ashok M; Tripathi, Surya Kant; Gupta, Bipin Kumar; Srivastava, Avanish Kumar
• Is Part Of: Materials research express. Volume 2:Number 7(2015)
• Publication Date: 2015-07-29
• Subjects: Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/2/7/075013
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: Herein, we have investigated the various characteristics of two structurally different phases of Al2 O3 nanowires: (i) γ -Al2 O3 (cubic) and (ii) θ -Al2 O3 (monoclinic). These nanowires were synthesized via hydrothermal treatment followed by calcination. The structural and luminescent properties were analyzed by scanning electron microscopy, high-resolution transmission electron microscopy and time-resolved photoluminescence spectroscopy. A plausible formation mechanism was proposed on the basis of experimental observations and analysis. These nanowires of both phases exhibit blue emission at ∼466 nm (2.65 eV) upon 253 nm UV excitation wavelength. The time-resolved photoluminescence spectroscopy indicated that the decay time ( τ ) of θ -Al2 O3 nanowires ( τ = 273 picoseconds) is longer than that of γ -Al2 O3 nanowires ( τ = 198 picoseconds). Moreover, these Al2 O3 nanowires were dispersed in ferroelectric liquid crystal (FLC) to observe their effect on the electro-optical characteristics. The electro-optical response of the composite devices showed faster electro-optical response, thereby suggesting potential applications in electro-optical shutters and modulators.