Shape‐Induced Enhanced Luminescent Properties of Red Phosphors: Sr₂MgSi₂O₇:Eu³⁺ Nanotubes

Abstract

Sr 2 MgSi 2 O 7 :Eu 3+ nanotubes with red phosphor luminescent properties were successfully synthesized via a low-temperature hydrothermal route in order to understand the underlying relationship between shape and luminescent properties. The one-dimensional shape results in an obvious improvement of color purity. From emission spectra, the relative intensity of 5 D 0 Ǟ 7 F 2 to 5 D 0 Ǟ 7 F 1 transitions in tubular phosphors is higher than that of bulk material. The better color purity results from the more distorted lattices and relatively lower crystal symmetry around Eu 3+ ions, which ascribes to

Enhancement of Host Excitation-Mediated Photoluminescence and Preferential Quenching of Direct Photoactivator Excitation-Mediated Photoluminescence by Exfoliation of Layered KLa0.90Sm0.05Nb2O7into La0.90Sm0.05Nb2O7Nanosheets

“…Factors such as defect sites might be causing these energy trapping processes. [39][40][41] Exfoliation of the bulk layered compound KLa 0.90 Sm 0.05 Nb 2 O 7 into La 0.90 Sm 0.05 Nb 2 O 7 nanosheets reduced the emission decay time of the host excitation (process 12) -mediated emission significantly to τ ) 0.24(5) ms, and that of the direct Sm 3+ excitation (process 2) -mediated emission was not measurable due to its low intensity (Figure 12). Such a decrease in τ and intensity has also been observed in other Ln-activated phosphors upon decreasing their size to nano-order.…”

Eu3+ activated M6AlP5O20 (M=Sr/Ba/Mg) novel red phosphors

“…In order to obtain red phosphors with high color purity, it is necessary to increase the relative intensity of 5 D 0 -7 F 2 to 5 D 0 -7 F 1 transitions. It is well known that the relative intensities of the 5 D 0 -7 F 2 to 5 D 0 -7 F 1 transitions strongly depend on the local symmetry of Eu 3 þ ions [24]. These luminescence bands are characteristic emissions of trivalent europium ions, commonly in the visible region (orange/red) spectral region and it consists typically of two bands, which corresponds to 5 concentration is illustrated in Table 1.…”

Synthesis of KMgCl3 nanomaterial and luminescence of Ce3+/Dy3+/Eu3+ by different routes

“…Trivalent Eu ion, as one of the promising species that provide optical emission in red color regions, has been doped in various compounds. Trivalent Eu ion has been expected as one of the promising species that provide optical devices in red color regions and many investigations have been conducted in various compounds [11][12][13]. Trivalent Eu emission is very useful for studying the nature of metal coordination in various systems owing to its non-degenerate emitting 5 D 0 state.…”