Abstract
Magnetic field and temperature dependent (32+ (RBY) of the host material, and the OS(bPY)32+ (OBY) dopant, are reported as a function of the orientation of B. Differences are seen for E||B and E| B, little effect is seen for B||c. Strong energy transfer previously reported between RBY and OBY is seen to be dependent on the applied magnetic field. OBY luminescence has more detailed fine structure, first seen here, with some similarities but striking differences to the weak structure seen for RBY in the PFa6 host. A marked triplet structure, with -35 cm-1 spacing, is seen throughout the spectrum. The triplet has two origin patterns spaced by 7±1 cm-1. The two higher energy components of the triplet pattern move (+)1 cm-1 at 5T (B| c). Of the two triplet patterns, only the lower energy set has a strongly enhanced intenSity (x400) for B(4T)||E at 1.4 K. The phonon structure built upon these origins is analysed.
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