A single host phosphor Ca3(SiO3)3:Eu2+, Mn2+ with good monodispersity for phosphor-converted white LEDs.

• A single host whit emitting phosphor Ca 3 (SiO 3) 3 :Eu2+, Mn2+ is monodispersed and uniform spherical particles. • The samples are monodispersed and uniform spherical particles with a diameter about 700 nm. • The nonradioactive energy transfer from the lowest 5d levels of Eu2+ to 3d excited levels of Mn2+ was efficient. Eu2+ ions were excited by UV LEDs chip and transmitted energy to Mn2+ ions, then emitted white light. • The color-rendering index and high correlated color temperature of Ca 3 (SiO 3) 3 :Eu2+, Mn2+ x can be adjusted by simply changing the concentration of Eu2+ and Mn2+. A single host phosphor Ca 3 (SiO 3) 3 :Eu2+, Mn2+ (CSO: Eu2+, Mn2+) with good monodispersity has been synthesized by high temperature solid state reaction combined with precursor, using porous silica as template and raw material. The phase, size and surface morphology of the phosphor were measured by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Luminescence properties were characterized by photoluminescence excitation (PLE) and emission spectra from room temperature to 480 K. CSO: Eu2+ has strong excitation band in UV region and emits blue light. To compensate for the lack of orange-red emission region and avoid using multiple phosphors, Mn2+ ions are introduced into the Ca2+ sites. The remarkable enhancements of the orange band attributed to an efficient nonradioactive energy transfer from Eu2+ to Mn2+, which has been testified by the photoluminescence spectra and fluorescence decay dynamics. The emitting light of Eu2+, Mn2+ co-doped CSO could be modulated from cool white to warm white by changing the molar ratio of Eu2+ and Mn2+. [ABSTRACT FROM AUTHOR]