Tuning of crystal phase and luminescence properties of Gd2(MoO4)3:Dy3+ phosphors

Enhanced green emissions of Er3+/Yb3+ co‐doped Gd2(MoO4)3 by co‐excited up‐conversion processes

“…[20][21][22] Besides the sensitizer and activator, the host matrix also plays an important role in up-conversion luminescence. Because of its low toxicity, thermal stability and high photo-chemical stability, [23][24][25][26] Gd 2 (MoO 4 ) 3 was chosen as the host matrix in our work.…”

“…[20][21][22] Besides the sensitizer and activator, the host matrix also plays an important role in up-conversion luminescence. Because of its low toxicity, thermal stability and high photo-chemical stability, [23][24][25][26] Gd 2 (MoO 4 ) 3 was chosen as the host matrix in our work.In this work, we greatly increase the green emissions of Abbreviations used: I 980 , the integral intensity of green emissions under excitation with a 980 nm; I 808 , the integral intensity of green emissions under excitation with a 808 nm laser; I 980+808 , integral intensity of green emissions under co-excitation with both the 980 and 808 nm lasers; TEM, transmission electron microscopy; XRD, X-ray diffraction. …”

Synthesis and photoluminescence properties of Ca9Y(VO4)7:Dy phosphors for white light-emitting diodes

“…This solid-state lighting technology shows high potential for replacement of conventional light source due to its high efficiency, low energy consumption, long lifetime, little volume, and mercury pollution-free [6]. Undoubtedly, rare-earth ions have always been playing an important role in realizing w-LEDs due to their abundant emission colors based on 4f-4f or 5d-4f transitions [7]. Within rare-earth elements, Dy 3 þ ion with 4f 9 electronic configuration generally has two dominate emission bands in visible range: one is the blue emission at about 480 nm corresponding to the 4 F 9/2 -6 H 15/2 transition, the other is the yellow emission at about 571 nm corresponding to hypersensitive 4 F 9/2 -6 H 13/2 (ΔL ¼2, ΔJ¼2) transition, [7][8][9].…”

“…Undoubtedly, rare-earth ions have always been playing an important role in realizing w-LEDs due to their abundant emission colors based on 4f-4f or 5d-4f transitions [7]. Within rare-earth elements, Dy 3 þ ion with 4f 9 electronic configuration generally has two dominate emission bands in visible range: one is the blue emission at about 480 nm corresponding to the 4 F 9/2 -6 H 15/2 transition, the other is the yellow emission at about 571 nm corresponding to hypersensitive 4 F 9/2 -6 H 13/2 (ΔL ¼2, ΔJ¼2) transition, [7][8][9]. The latter is an electric dipole transition, which is strongly influenced by the chemical environment surrounding Dy 3 þ ions.…”

Electronic Structure and Luminescence Properties of Phosphor Li8Bi2(MoO4)7: Dy3+

“…As a typical white light emission ion, trivalent dysprosium (Dy 3+ ) ion has attracted much attention due to its two dominant emission bands in 460–500 nm blue regions and in 560–600 nm yellow regions . The former is assigned to 4 F 9/2 → 6 H 15/2 magnetic dipole transition, which is hardly varies with the local symmetry whereas the latter is attributed to the hypersensitive electric dipole transition 4 F 9/2 → 6 H 13/2 (Δ L =2, Δ J =2), its intensity is strongly influenced by the surrounding chemical environment around Dy 3+ . Yellow‐to‐blue emissions intensity ratio (Y/B) in the Dy 3+ ‐doped phosphors could be tuned by adjusting the composition and structure of the sample, which leads to the varied emitting color and chromaticity coordinates .…”