The investigation on the mechanism of the increased decay time in red SrS:Eu2+,Dy3+ phosphor

Kong, Mingguang; Fang, Ming; Tan, Xiaoli; Liu, Mao; Shang, Guo Liang; Fei, Guang Tao; Zhang, Lide

doi:10.1016/j.matchemphys.2017.12.031

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…The afterglow of Eu 2+ was increased by the Tm 3+ doping because electrons supplied to V S was increased. This is consistent with the fact that the extension of the afterglow time has been reported for trivalent ions such as Tm 3+ , Dy 3+ , Pr 3+ , and Sm 3+ [7][8][9][10][11][12][13][14][15][16].…”

Section: Afterglow and Effects Of Eu 2+supporting

confidence: 91%

“…The typical decay time of the blue emission is 6 ms (figures 5(b) and 7(b)), and the decay profile includes multiple decay times. The carrier density is increased by including trivalent ions such as Tm 3+ in CaS because Tm 3+ replaces Ca 2+ and creates charge defects [9][10][11][12][13][14][15][16].…”

Section: Afterglow and Effects Of Eu 2+mentioning

confidence: 99%

“…Eu 2+ doped calcium sulfides co-doped with rare-earth ions (Tm 3+ , Pr 3+ , and Dy 3+ ) are well known as high-intensity red phosphors [9][10][11][12][13][14][15]. These phosphors are also expected to be applied in biological imaging using long-afterglow and photostimulated red luminescence under near-infrared excitation [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Red afterglow and luminescence arising from defects in CaS:Eu²⁺, Tm³⁺

Suda¹,

Tamura²,

Yamaguchi³

et al. 2021

J. Phys. D: Appl. Phys.

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CaS:Eu2+, Tm3+ is a phosphor known to emit a long afterglow of red emission (650 nm) when excited by blue light (450 nm). It shows a long afterglow time of 700 s for Eu = 0.05% and Tm = 2%. The mechanism of this afterglow is investigated using time-resolved fluorescence (TR-F) spectroscopy from the nanosecond to millisecond region. At room temperature, it is not possible to investigate shallow levels because of the effects of thermal vibrations. The mechanism of the emission characteristics at room temperature would be affected by these levels that can be observed only at low temperatures. Therefore, the samples are cooled to 15 K for the TR-F measurements. The host material CaS emits blue light (420 nm) arising from sulfur defects, and the typical decay time is measured to be 6 ms. This blue emission becomes stronger when Tm3+ is doped. Furthermore, the doped Eu ions emit a broad red spectrum at 650 nm originating from the Eu2+-specific 4f65d1–4f7 transition. When the excitation is ceased, the red emission decays with a fast time constant of 0.6 μs. This value is a typical decay time for Eu2+. This red emission has multiple decay time constants, and a component with a decay time of 6 ms appears. This 6 ms decay time is the same as that of the blue emission from the sulfur defects, which have an important role on the red afterglow.

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