Anzeige
Erschienen in:
01.03.2015
Enhanced novel white emission in Ca3(PO4)2:Dy3+ single-phase full-color phosphor by charge compensation
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 3/2015
EinloggenAktivieren Sie unsere intelligente Suche, um passende Fachinhalte oder Patente zu finden.
Wählen Sie Textabschnitte aus um mit Künstlicher Intelligenz passenden Patente zu finden. powered by
Markieren Sie Textabschnitte, um KI-gestützt weitere passende Inhalte zu finden. powered by
Abstract
A novel single-composition white-emitting phosphor Ca3(PO4)2:Dy3+ has been synthesized by a high-temperature solid-state reaction. The effect of charge compensators on luminescent properties of Ca3(PO4)2:Dy3+ is systematically investigated by the X-ray powder diffraction, UV–Vis diffuse reflectivity, photoluminescence (PL) properties and lifetime.
It is observed that the PL intensity of Dy3+ under 350 nm excitation increases in the order of Ca2.95(PO4)2:0.05Dy3+, Ca2.90K0.05(PO4)2:0.05Dy3+, Ca2.90Na0.05(PO4)2:0.05Dy3+, Ca2.90Li0.05(PO4)2:0.05Dy3+, and Ca2.95(P0.95Si0.05O4)2:0.05Dy3+. The lifetimes of Dy3+ are 605.00, 604.67, 615.01, 645.64 and 621.26 μs, respectively. A charge compensation model is proposed to explain the changes in the emission intensity and lifetime of Dy3+ in Ca3(PO4)2 with different compensation methods. A white light-emitting diode (LED) was fabricated by using the white-emitting single-composition Ca2.95(P0.95Si0.05O4)2:0.05Dy3+ pumped by a 365 nm UV-chip.
Our results indicated that the CIE chromaticity coordinates, color rendering index and correlated color temperature for white UV-LEDs were (0.302, 0.324), 83, and 6947 K, respectively. Therefore, our novel white Ca2.95(P0.95Si0.05O4)2:0.05Dy3+ can serve as a key material for phosphor-converted white-light UV-LEDs.