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Photoluminescence and piezoelectricity investigation of La1.98Nd0.02Ti2O7, Sm1.98Ce0.02Ti2O7 and Er1.98Gd0.02Ti2O7 multifunctional materials

Öztürk Esra, Sarilmaz Ebru

Materials Science Poland

2019

Vol. 37, No. 4

607--614

Nd³⁺ doped La₂Ti₂O₇, Ce⁴⁺ doped Sm₂Ti₂O₇ and Gd doped Er₂Ti₂O₇ have been synthesized at different reaction temperatures using solid state reaction method, and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), differential thermal analysis (DTA), thermogravimetric analysis (TG). Excitation spectra, emission spectra and decay time curves of the samples were investigated by photoluminescence spectrophotometer (PL) and typical transitions of rare earth ions were observed. Dielectric properties, piezoelectric properties and Curie temperature of the obtained luminescent materials were measured for electrical characterization. The results showed that all materials have both photoluminescent and piezoelectric properties and show high Curie temperature.

Working conditions for the low location lighting system on passenger ships

Zalesińska M., Wandachowicz K.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

2015

nr 43 (115)

125--130

An emergency escape lighting system based on Low Location Lighting on passenger ships is required to ensure proper visual guidance to allow safe egress routes for evacuation of the ship’s deck, even in very dense smoke. LLL system components must be installed in specific locations of the escape route, as well as exhibiting the required photometric characteristics within a specified time after triggering. The luminance decrease curve for materials used for the surfaces of LLL system components depends on a number of factors, e.g. spectral distribution of light sources and light exposure parameters. Ascertaining the influence of specific factors allows optimization of the proper means of material exposure to achieve the required photometric characteristics. This article presents the normative requirements for LLL systems installed on passenger ships regarding their placement and photometric characteristics. It presents actual working conditions for LLL systems and laboratory test results for two photoluminescent materials, as well as formulating recommendations to ensure proper working conditions for the LLL system.