A novel UV pumped white-emitting phosphor La₃SbO₇:Dy³⁺ for white light-emitting diodes

Abstract

The dysprosium activating La3SbO7 white-emitting phosphors were prepared via solid-state route at 1350°C in air atmosphere and its photoluminescence properties were examined by X-ray diffraction (XRD) and photoluminescence spectra in details. La3SbO7:Dy3+ phosphor with excitation at 353 nm emitted blue light (490 nm) and yellow (580 nm) which were assigned to 4F9/2–6Hj/2 transitions (J=15, 13), respectively. Moreover, the transition 4F9/2–6H13/2 was the strongest emission intensity between two typical emission bands. The CIE of prepared phosphors entered into white region. The optimal emission intensity of the La3SbO7:Dy3+ luminescent materials was realized when x = 0.15 and the concentration quenching mechanism of Dy3+ has also been tested. And the La3SbO7:Dy3+ can be as a white-emitting phosphor applied in n-UV LEDs on results.

Tuning white light emission using single-component tetrachroic Dy3+ metallacrowns: the role of chromophoric building blocks

“…Among different visible-emitting Ln 3+ -based materials, Dy 3+ ones are unique in their ability to produce WLE. [46][47][48][49][50][51][52][53][54][55] Indeed, a typical emission spectrum of Dy 3+ in the visible range contains three fundamental components: a blue, a yellow and a red one arising from the 4 F 9/2 / 6 H 15/2 (∼480 nm), 4 F 9/2 / 6 H 13/2 (∼575 nm), and 4 F 9/2 / 6 H 11/2 (∼660 nm) electronic transitions, respectively. Therefore, the WLE of the material can be tuned by modifying the Dy 3+ emission prole and the relative intensities of each of these transitions.…”

“…[39][40][41][42] Single component Dy 3+ is a special lanthanide(III) ion for such application as its possesses two main groups of sharp emission bands in the green and in the red spectral domains that allow for the development of single-component WLE with the addition of a blue emission component arising from the same compound. [46][47][48][49][50][51][52][53][54][55] Several inorganic compounds have shown an ability to tune the CIE coordinates by controlling the concentration of the Dy 3+ dopant. These examples include Dy 3+doped chloroborosilicate glasses, 56 barium silicate, 57 zincaluminum-sodium-phosphate, 58 or lithium-zinc borosilicate 59 glasses.…”

Thermally stable and color-tunable bi-activated (Dy3+/Eu3+) alkaline earth metasilicate phosphor for luminescent devices

“…4,5 Owing to their plethora of merits, including lifespan, high durability, affordability, and environmental friendliness, phosphor-based luminous devices have attracted the attention of researchers. 6,7 It is commonly known that commercial w-LEDs are fabricated by coating a yellow emitting YAG:Ce 3+ (Ce 3+ ion-doped yttrium aluminium garnet) phosphor, with a reasonably broad spectrum, on blue-emitting InGaN LED chip. One such fabricated w-LED shows a deprived value of color rendering index and correlated colour temperature caused by the dearth of red colour emitting components.…”