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We develop Dy$^{3+}$-doped yttrium complexes for use as two-color thermometry(TCT) phosphor molecular crystals in heterogeneous materials. These complexesinclude: Dy:Y(acac)$_3$(phen), Dy:Y(hfa)$_3$(DPEPO), Dy:Y(4-BBA)$_3$(TPPO),Dy:Y(acac)$_3$, and Dy:Y(acac)$_3$(DPEPO), where the Dy/Y ratio is 1:9. Wecharacterize the materials' photoluminescence at different temperatures todetermine the TCT calibration parameters and the degree to which thermalquenching influences the emission. From this data we observe a link between theexcited state lifetime at room temperature and the degree to which the materialis susceptible to thermal quenching (i.e. materials having long roomtemperature lifetimes are more resistant to thermal quenching than materialswith short room temperature lifetimes). Of the five complexes tested we findthat Dy:Y(acac)$_3$(DPEPO) has the best thermal performance, with the mostlikely source of improvement being DPEPO's compact rigid structure. Thisrigidity helps with energy transfer to the Dy$^{3+}$ ion, suppressesnon-radiative loss modes, and reduces exciplex formation.

Dy$^{3+}$-doped Yttrium Complex Molecular Crystals for Two-color Thermometry in Heterogeneous Materials