Trivalent bismuth is a popular main group ion showing
versatile
luminescent behaviors in a broad spectral range from ultraviolet to
visible, but barely in the near-infrared (NIR) region. In this study,
we have observed unexpected NIR emission at ∼744 nm in a Bi3+-doped pyrochlore, Y2Ti2O7 (YTOB). Our first-principles electronic structure calculation and
analysis of the Bi local structure via extended X-ray absorption fine
structure indicate that only Bi3+ species appears in YTOB
and it has a similar local environment to that of Y3+.
The NIR emission is assigned to a Ti4+ → Bi3+ metal-to-metal charge transfer process. Moreover, we have
demonstrated dual-mode luminescence thermometry based on the luminescence
intensity ratio (LIR) and lifetime (τ) in 0.5% Bi3+ and 0.5% Pr3+ co-doped Y2Ti2O7 (YTOB0.5P0.5). It exhibits high thermometric sensitivity
simultaneously in the cryogenic temperature range from 78 to 298 K
based on τ of the NIR emission of Bi3+ at 748 nm
and in the temperature range of 278–378 K based on the LIR
of Bi3+ to Pr3+ emissions (I
748/I
615). As a novel LIR-τ
dual-mode thermometric material over a wide temperature range, the
maximum relative sensitivities of the YTOB0.5P0.5 reach 3.53% K–1 at 298 K from the τ mode and 3.52% K–1 at 318 K based on the LIR mode. The dual-mode luminescence thermometry
with high responsivity from our Bi3+-based pyrochlore Y2Ti2O7 phosphor opens a new avenue for
more luminescent materials toward multi-mode thermometry applied in
complex temperature-sensing conditions.