Enhancement of the luminescence properties of Sr₃(PO₄)₂:Dy³⁺,Li⁺ white‐light‐emitting phosphors by charge compensator Li⁺ co‐doping

Abstract

Sr (PO ) :Dy ,Li phosphors were prepared using a simple high temperature solid method for luminescence enhancement. The structures of the as-prepared samples agreed well with the standard phase of Sr (PO ) , even when Dy and Li were introduced. Under ultraviolet excitation at 350 nm, the Sr (PO ) :Dy sample exhibited two emission peaks at 483 nm and 580 nm, which were due to the F → H and F → H transitions of Dy ions, respectively. A white light was fabricated using these two emissions from the Sr (PO ) :Dy phosphors. The luminescence properties of Sr (PO ) :Dy ,Li phosphors, including emission intensity and decay time, were improved remarkably with the addition of Li as the charge compensator, which would promote their application in near-ultraviolet excited white-light-emitting diodes.

Crystal structural and photoluminescence properties of Eu3+ doped MgZn2(PO4)2 phosphors by R+ (R = Li, Na, K) charge compensation

“…In addition, it can improve the asymmetry around the Eu 3+ location. 38,40,41 Thus, emission enhancement can be observed in R + -compensated samples. Furthermore, it is observed that Na + as a charge compensation corresponds to the highest luminous intensity.…”

“…36 The addition of Li + , Na + , or K + ions to luminescent materials as charge compensation has been attracting considerable attention. 36–47…”

“…36,37 Some studies have shown that charge compensation is considered as one of the important ways to balance charge and enhance the emission intensity of phosphor. [36][37][38][39][40][41][42][43][44][45][46][47] Generally speaking, when a metal ion replaces elements with different valence states in the matrix, Na + , Li + , or K + ions are needed for charge compensation. 36 The addition of Li + , Na + , or K + ions to luminescent materials as charge compensation has been attracting considerable attention.…”

“…36 The addition of Li + , Na + , or K + ions to luminescent materials as charge compensation has been attracting considerable attention. [36][37][38][39][40][41][42][43][44][45][46][47] So far, no study has been carried out on the luminescence properties of MgZn 2 (PO 4 ) 2 :Eu 3+ ,R + (R = Li, Na, and K) charge compensation phosphors. In this study, using traditional hightemperature solid-state method, the orange-red emitting MgZn 2 (PO 4 ) 2 :Eu 3+ ,R + phosphors were synthesized; Eu 3+ acted as the activator and R + (R = Li, Na, and K) served as the charge compensation agent.…”

Anomalous luminescence properties and cytotoxicity assessment of Sr3(PO4)2 co-doped with Eu2+/3+ ions for luminescence temperature sensing

“…and are of great interest primarily due to their potential usage as efficient phosphors in light-emitting diode (LED) devices. 2 Among them phosphates such as calcium hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ) and β-tricalcium diphosphate (Ca 3 (PO 4 ) 2 ) are used in implantology due to their high similarity to the inorganic bone tissues. These compounds activated with lanthanide ions are studied as bio-labels for in vitro and in vivo imaging.…”