Tunable white light emitting from mono Ce3+ doped Sr5(PO4)2SiO4 phosphors for light emitting diodes

The photoluminescence properties of mono Ce3+ doped Sr5(PO4)2SiO4 (SPS) apatite phosphors, prepared via a solid-state reaction at high temperature, were investigated in the ultraviolet region. The white light can be realized by adjusting the contents of activator Ce3+ or the excitation wavelength. Upon 365 nm excitation, SPS: 0.05Ce3+ shows bright white light (34.74% of YAG) with CIE color coordinates of (0.33, 0.34), a superior color-rendering index of 90 and correlated color temperature of 5603 K, suitable for potential use based on 365 nm UV-InGaN chip.

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► White emitting phosphor Sr5(PO4)2SiO4:Ce3+ was prepared via the high temperature reaction.
► The luminescence property and thermal stability were evaluated upon UV irradiation.
► The energy transfer process between Ce1 and Ce2 has been confirmed and demonstrated.