Magnetic field effects on the luminescence of Ln2[Pt(CN)4]3⋅<i>y</i>H2O single crystals

Abstract

Magnetic field effects on the E⊥c-polarized emission of Ln2[Pt(CN)4]3⋅yH2O single crystals (LnCP) with Ln=Lu, Yb, Tm, Er, Ho, Dy, Tb, Gd, Eu, Ce, and La at 1.9 K are reported. Compared to the MCP’s (M≠Ln), the influence of the magnetic field on lifetime, intensity, and spectral position of the LnCP emission is rather weak—with the exception of LuCP, which behaves very similar to the MCP’s (M≠Ln). The behavior of the other LnCP’s can be explained assuming an admixture of (Ln, 4f) orbitals to the E⊥c-emitting Pt-complex state A′1u which competes with the magnetic field induced admixture of the (Pt, Eu ) state, and thereby partially anticipating the magnetic field effects. The strong localization of the A′1u is confirmed by magnetic field induced effects on the emission of Yb3+, Tb3+, Gd3+, and Eu3+ doped LuCP.