Long afterglow phosphorescent sensor materials for fiber-optic thermometer

Abstract

Development of erbium-doped silica sensor probe for fiber-optic fluorescence thermometer Rev. Sci. Instrum. 76, 094902 (2005); 10.1063/1.2038508 Low temperature fluorescence thermometer application of long afterglow phosphorescent Sr Al 12 O 19 : Eu 2 + , Dy 3 + crystals Rev. Sci. Instrum. 76, 084901 (2005); 10.1063/1.1988147 Fiber-optic thermometer using Cr-doped YAlO 3 sensor head Rev. Sci. Instrum. 74, 3883 (2003); 10.1063/1.1589582 Fabrication of ruby sensor probe for the fiber-optic thermometer using fluorescence decay Rev. Sci. Instrum. 73, 3656 (2002);Long duration phosphorescent SrAl 2 O 4 phosphors doped with various auxiliary activators ͑Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu͒ have been evaluated for the fiber-optic thermometer application. In this thermometer, temperature was measured based on the temperature dependence of the lifetime and/or intensity of the afterglow phosphorescence which was dominated by the thermal excitation of trapped carriers. Characteristics of the long phosphorescent fiber-optic thermometer are quite different from those of the conventional thermometer using fluorescent lifetime of the phosphors. Lifetime and intensity of the afterglow phosphorescence from the long afterglow phosphorescent sensor heads show large positive temperature coefficients in the narrow temperature region around room temperature. Sensitivity and temperature range of the long phosphorescent fiber-optic thermometer depend strongly on the trap depth and the trap density of phosphors. Since the trap depth and the trap density vary with auxiliary activator elements, a variety of fiber-optic thermometers with high sensitivity in various temperature ranges will be able to be developed using Eu 2ϩ doped SrAl 2 O 4 codoped with various auxiliary activator Ln 3ϩ ions ͑LnϭY,

Long afterglow characteristics of thin film phosphor fabricated by laser ablation

“…Recently, we have proposed an application of the long afterglow SrAl 2 O 4 :Eu,Dy phosphors for a sensor head because the afterglow phosphorescent characteristics of the intensity and decay time depend dramatically on the ambient temperature [4]. Moreover, the thin film fabrication of this long afterglow SrAl 2 two-dimensional temperature sensing by the scanning of the excitation light and the monitoring the afterglow characteristics depending on the temperature.…”

Afterglow phosphor materials Y2O2S: Eu, Mg, Ti doped with various Gd concentrations

“…Guo et al [23] reported the enhancement mechanism of luminescent properties of RE 3+ (RE 3+ = Eu 3+ , Sm 3+ , Dy 3+ ) in Y 2 O 2 S phosphor by a trace of Tb 3+ . Aizawa et al [24] reported the SrAl 2 O 4 :Eu 2+ phosphor doped with Nd, Sm, Lu, Gd, Dy and Y, and found that the long afterglow phosphorescence was influenced by the depth and density of the traps. Chen et al [1] reported that the luminescent properties of SrAl 2 O 4 :Eu 2+ , Dy 3+ could be significantly modified by the Yb 3+ ions doping.…”

Characteristics of long afterglow phosphorescent calcium aluminate crystals for fluorescence thermometer application

“…Long afterglow phosphorescent SrAl 2 O 4 crystals including traps with high concentration are found to be a highly sensitive sensor head material with long temperature coefficient [8,9]. The high temperature coefficient of a SrA1 2 O 4 based sensor head is due to the thermal excitation process of trapped carriers at the trap levels with E ¼ 0:5 eV [8,9].…”

“…The high temperature coefficient of a SrA1 2 O 4 based sensor head is due to the thermal excitation process of trapped carriers at the trap levels with E ¼ 0:5 eV [8,9]. In addition to SrAl 2 O 4 phosphors, Eu doped CaAl 2 O 4 co-doped with rare earth elements as the auxiliary activators are also expected to be highly sensitive sensor head materials because of their high trap density.…”

“…In addition to SrAl 2 O 4 phosphors, Eu doped CaAl 2 O 4 co-doped with rare earth elements as the auxiliary activators are also expected to be highly sensitive sensor head materials because of their high trap density. [8,9]. The phosphor specimens, 5 mm in diameter and 2 mm thick, were sliced from the grown crystals.…”