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Nd3+/Yb3+ Co-Doped Germanate Glass Fibers Toward Dual-Mode Fluorescence Intensity Ratio and Lifetime Thermometry
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J
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宋
Q
DOI：10.1002/lpor.202501909.png)
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Abstract
En 中文
Fluorescence intensity ratio (FIR) thermometry is recognized for its fast response and high-resolution characteristics; however, its performance is hindered by wavelength-dependent absorption. Fluorescence lifetime sensing circumvents this limitation; however, it generally exhibits low temperature sensitivity. Here, this trade-off is addressed through the integration of dual-mode FIR and lifetime thermometry within a well-designed Nd3+/Yb3+ co-doped germanate glass fiber. The glass matrix enables efficient up-conversion emissions (750/810/890 nm) via Yb3+→Nd3+ energy transfer, in addition to long-lived NIR-II emission at 1030 nm and compatibility with fiber preparation. A temperature sensitivity of 1.0% K−1 at 293 K is achieved in the FIR mode using thermally coupled transitions (4F7/2/4F5/2→4I9/2). Simultaneously, a Yb3+ lifetime-based sensitivity of 0.5% K−1 is obtained, effectively mitigating depth-related inaccuracies associated with FIR measurements. We further show a demo from the designed materials to actual devices by fabricating a flexible fiber sensor composed of a GeO2-Nb2O5-BaO (GNB) glass core and polydimethylsiloxane (PDMS) cladding, which is employed for real-time temperature monitoring within the range of 20–80 °C, exhibiting less than 1% hysteresis over five thermal cycles. These findings demonstrate a promising approach for depth-tolerant, dual-mode optical thermometry for accurate and real-time temperature sensing in biomedical environments.
Keywords:
fluorescence intensity ratio
fluorescence lifetime
germanate glass
optical thermometry
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