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24 Dec 2012

Volume 101, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 101, 263501 (2012); http://dx.doi.org/10.1063/1.4772532 (4 pages)

Youngki Yoon and Sayeef Salahuddin
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Dielectric and enhanced pyroelectric properties of (Pb0.325Sr0.675)TiO3 ceramics under direct current bias field

Xiuyun Lei, Xianlin Dong, Chaoliang Mao, Ying Chen, Fei Cao, and Genshui Wang

Appl. Phys. Lett. 101, 262901 (2012); http://dx.doi.org/10.1063/1.4773219 (3 pages) | Cited 1 time

Online Publication Date: 26 December 2012

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(Pb0.325Sr0.675)TiO3 (PST) ceramics were prepared by a traditional solid-state reaction technique. The dielectric and enhanced pyroelectric properties of PST ceramics were investigated under a DC bias field. The dielectric permittivity and dielectric loss of PST ceramics at Curie temperature were 2.97 × 10−4 and 0.006 without DC bias field, respectively. With a DC electric field of 0–500 V/mm, the maximum pyroelectric coefficient and the largest figure of merit (Fd) of PST ceramics were obtained, about 60 × 10−8 C cm−2 K−1 and 26 × 10−5 Pa−1/2, respectively. PST ceramics with such superior electric field enhanced pyroelectric properties have the potential for uncooled focal plane array detectors application.
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77.70.+a Pyroelectric and electrocaloric effects
77.22.Ch Permittivity (dielectric function)
77.22.Gm Dielectric loss and relaxation

Electrically modulated photoluminescence in ferroelectric liquid crystal

Prasun Ganguly, T. Joshi, S. Singh, D. Haranath, and A. M. Biradar

Appl. Phys. Lett. 101, 262902 (2012); http://dx.doi.org/10.1063/1.4773366 (3 pages)

Online Publication Date: 27 December 2012

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Electrical modulation and switching of photoluminescence (PL) have been demonstrated in pure deformed helix ferroelectric liquid crystal (DHFLC) material. The PL intensity increases and peak position shifts towards lower wavelength above a threshold voltage which continues up to a saturation voltage. This is attributed to the helix unwinding phenomenon in the DHFLC on the application of an electric field. Moreover, the PL intensity could be switched between high intensity (field-on) and low intensity (field-off) positions. These studies would add a new dimension to ferroelectric liquid crystal's application in the area of optical devices.
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61.30.-v Liquid crystals
77.80.Fm Switching phenomena
77.84.Nh Liquids, emulsions, and suspensions; liquid crystals
78.55.Bq Liquids
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