Synthesis, PL characterizations and concentration quenching effect in Dy³⁺ and Eu³⁺ activated LiCaBO₃ phosphor

Abstract

LiCaBO3 :Dy(3+) /Eu(3+) phosphors were synthesized by a solid-state reaction. The synthesized materials were characterized using powder X-ray diffraction pattern (XRD) for confirmation. All the structural parameters were calculated from the XRD data. Scanning electron microscopy (SEM) images showed rod-like morphology. Photoluminescence (PL) emission spectra showed two emissions (484 and 577 nm) in Dy(3+) -doped LiCaBO3 :Dy(3+) phosphors with the concentration quenching effect and the critical distance was calculated to be about 22.76 Å. LiCaBO3 :Eu(3+) phosphor was effectively excited by a near-UV light of 392 nm. The emission spectra exhibited the transition from (5) D0 level to (7) FJ (J = 0-2) with main emission at 614 nm, which comes from the electrodipole transition because of the asymmetric point group. The quenching concentration of Eu(3+) is about 0.2 mol%, and the critical distance was calculated to be about 38.93 Å.

Barium molybdate white emitting phosphor synthesized at room temperature by co-precipitation

“…This can be interpreted as a concentration quenching, in which emission intensity decreases due to the non-radiative energy transfer generated between the activator Sm 3+ ions. 40 Photoexcited rare earth-doped semiconductors suffer from this so-called concentration quenching effect, in which the intensity of the rare earth emission decreases with increasing dopant concentration. This effect is dominant when the excitation energy moves between many ions within the time required for radioactive decay.…”

Photo‐ and radioluminescence of Dy3+‐doped oxide glass with high‐Gd2O3 content

“…The composition of the obtained Dy:SABG glass was 2.3SiO 2 –14.8Al 2 O 3 –7.6B 2 O 3 –74.2Gd 2 O 3 –1.1Dy 2 O 3 (wt.%), determined by X‐ray fluorescence (XRF) technique with the Dy/Gd ratio of 1.49 at.%. Dy concentration was chosen to achieve the best scintillation efficiency as it is known that at concentration of few percent the cross‐relaxation effects occur between Dy 3+ ions which leads to luminescence efficiency decrease . The Dy:SABG glass was cut to pieces and polished with dimension of about 8 × 8 × 2 mm 3 , and was used for all measurements.…”

“…In this work, Dy 3þ -doped oxide glass with high- concentration was chosen to achieve the best scintillation efficiency as it is known that at concentration of few percent the cross-relaxation effects occur between Dy 3þ ions which leads to luminescence efficiency decrease [19][20][21]. The Dy:SABG glass was cut to pieces and polished with dimension of about 8 Â 8 Â 2 mm 3 , and was used for all measurements.…”

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

“…From Figure 8 we find that as the concentration increases the lifetime becomes shorter, with the largest change occurring when going from 1 mol% to 5 mol%. The influence of concentration quenching on lanthanide luminescence lifetimes has been studied in depth [48,[62][63][64][65][66][76][77][78][79][80] with the two main mechanisms of concentration quenching in solid-state materials being: long-range Energy Transfer (LRET) [62][63][64][65]80], and short-range Dexter electron exchange [66]. These mechanisms result in different functional behavior of the lifetime as a function of concentration.…”