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Hochauflösende Photolumineszenzspektroskopie mit Eu3+ als Struktursonde offenbarte einen universalen Gittersymmetriebruch in Lanthanoid‐dotierten fehlgeordneten Kristallen. Die spektrale Gittersymmetrie für Eu3+ sinkt von Oh nach Cs (oder C2) in α‐NaYF4 und von C3h nach Cs in β‐NaYF4. Die Ergebnisse wurden durch Kristallfeldrechnungen bestätigt.
High‐resolution photoluminescence spectroscopy employing Eu3+ as the structural probe unambiguously revealed a universal breakdown of crystallographic site symmetry in lanthanide‐doped disordered crystals. The spectroscopic site symmetries of Eu3+ descend from crystallographic Oh to Cs (or C2) in α‐NaYF4, and from crystallographic C3h to Cs in β‐NaYF4, which were further verified by crystal‐field...
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