Charge Transfer-Triggered Bi Near-Infrared Emission in YTiO for Dual-Mode Temperature Sensing.

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 Bi-doped pyrochlore, YTiO (YTOB). Our first-principles electronic structure calculation and analysis of the Bi local structure via extended X-ray absorption fine structure indicate that only Bi species appears in YTOB and it has a similar local environment to that of Y. The NIR emission is assigned to a Ti → Bi 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% Bi and 0.5% Pr co-doped YTiO (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 Bi at 748 nm and in the temperature range of 278-378 K based on the LIR of Bi to Pr emissions (/). 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 at 298 K from the τ mode and 3.52% K at 318 K based on the LIR mode. The dual-mode luminescence thermometry with high responsivity from our Bi-based pyrochlore YTiO phosphor opens a new avenue for more luminescent materials toward multi-mode thermometry applied in complex temperature-sensing conditions.