A series of co-doped KSrPO₄ : Eu²⁺, Y³⁺ phosphors have been prepared through a high-temperature solid-state reaction at various temperatures. Luminescence spectroscopic characterization allowed to demonstrate that emission spectrum of original KSrPO₄ : Eu²⁺ phosphor that is typically dominated by Eu²⁺ 4f⁶5d¹ -> 4f⁷ emission can be significantly modified by co-doping with Y³⁺ ions, which results in appearance of a broad defect emission. The latter makes the phosphor potential for WLED application. The Y³⁺ co-doping related defect emission was found to get enhanced with the increase of Y³⁺ content and synthesis temperature. The nature and peculiarities of the new defect emission are discussed. Keywords: phosphors, solid-state reaction, defect emission, KSrPO₄ : Eu²⁺, Eu²⁺ 5d-4f emission.

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