Synthesis and luminescence characteristics of nitride Ca1.4Al2.8Si9.2N16:Ce3+, Li+ for light-emitting devices and field emission displays

Abstract

A green-emitting nitride phosphor Ca_1.4Al_2.8Si_9.2N₁₆:Ce³⁺, Li⁺ (CASN:Ce) has been successfully synthesized which is applicable to near-ultraviolet based light-emitting diodes (LEDs) and field emission displays (FEDs). The characteristic photoluminescence (PL) properties were studied in detail by PL excitation, emission spectra and time-resolved spectroscopy. CASN:0.10Ce exhibits broad-band green emission centered at ∼525 nm (FWHM ≈ 135 nm) under 395 nm excitation and with excellent thermal stability. The effect of host lattice composition on PL properties was also discussed. The cathodoluminescence (CL) spectra as a function of accelerating voltage and probe current were also studied. Excellent degradation resistance properties with good color stability were obtained by continuous low-voltage electron-beam excitation of the phosphor.