Fig. 5: Photoelectric properties of the LD driven red-emitting device constructed by using Mg₂Al₄Si₅O₁₈:Eu²⁺ phosphor.

The power density-dependent a luminescent spectra b luminous flux and luminous efficiency of Mg₂Al₄Si₅O₁₈:Eu²⁺ composite under the excitation of 445 nm blue laser. c Time-dependent luminous flux of the composite at a fixed incident power density of 1.5 W mm⁻², the inset show the photograph of red LD device. d The incident power density-dependent luminous flux and luminous efficiency of the CaAlSiN₃:Eu²⁺ ceramic²²