Photoluminescence and cathodoluminescence properties of Na2MgGeO4:Mn2+ green phosphors

Abstract

Mn²⁺-doped Na₂MgGeO₄ green phosphors were prepared using a solid-state reaction method. X-ray diffraction, scanning electron microscopy, and photoluminescence (PL) and cathodoluminescence (CL) studies were utilized to characterize the prepared phosphors. Under UV radiation (297 nm), the Na₂MgGeO₄:0.03Mn²⁺ phosphor showed a strong green emission corresponding to the ⁴T₁(⁴G)–⁶A₁(⁶S) transition of the Mn²⁺ ions. A possible interaction mechanism was investigated. The CL spectra as a function of accelerating voltage and probe current were also measured. Under continuous low-voltage electron-beam excitation, the phosphor exhibited excellent degradation properties and good color stability. The results indicate that the Na₂MgGeO₄:0.03Mn²⁺ phosphor could be a suitable green phosphor candidate for FEDs.