Sensitization of Nd ³⁺ Luminescence by Mn ⁴⁺ in Mn ⁴⁺ , Nd ³⁺ Codoped K _0.5 La _0.5 SrMgWO ₆

A series of Mn 4+ , Nd 3+ codoped K 0.5 La 0.5 SrMgWO 6 phosphors have been prepared by high‐temperature solid‐state reaction method. Under 468 nm excitation, near infrared emission bands centered at around 910 and 1064 nm are observed, assigned to the 4 F 3/2 → 4 I 9/2 and 4 F 3/2 → 4 I 11/2 transitions of Nd 3+ , respectively. The similarity between the excitation spectra in the 300–550 nm monitored at Mn 4+ 697 nm emission and those monitored at Nd 3+ 1064 nm emission as well as the lifetime shortening of Mn 4+ emission with Nd 3+ concentration increasing prove that the occurrence of the energy transfer sensitization from Mn 4+ to Nd 3+ . In terms of the analysis results based on Dexter's theory and Inokuti‐Horayama model, it is believed that the dipole–dipole interaction plays a key role in the energy transfer process.