Key Takeaways & Executive Findings
- •• • The Tb3+-doped glass scintillator achieves a record radioluminescence intensity of 350% of a standard BGO crystal, enabling higher sensitivity in X-ray detection systems. • • The material exhibits anti-thermal-quenching behavior: RL intensity at 633 K is 143% of its room-temperature value, whereas BGO and CsI:Tl drop to ~1%, ensuring reliable operation in high-temperature environments up to at least 633 K. • • High imaging resolution of 24 lp mm−1 is achieved, surpassing many commercial scintillators, which is critical for non-destructive testing and high-resolution X-ray imaging. • • Optical transmittance exceeds 88% at 542 nm, ensuring efficient light collection and minimal signal loss in imaging systems.
Abstract
The demand for high-performance scintillators in high-temperature applications, such as industrial flaw detection and oil exploration, necessitates materials with both high efficiency and thermal robustness. This work reports Tb3+-doped oxyfluoride glass scintillators exhibiting anti-thermal-quenching radioluminescence (RL). Three synergistic strategies were employed: (i) an oxyfluoride glass host providing a low-phonon-energy environment, (ii) increased structural densification of the glass network, and (iii) thermally enhanced energy transfer from Ce3+ to Tb3+. The resulting scintillators achieve an optical transmittance exceeding 88% at 542 nm, a record RL intensity of 350% relative to a standard Bi4Ge3O12 (BGO) crystal, and an imaging resolution of 24 lp mm−1. Notably, the RL intensity at 633 K reaches 143% of its room-temperature (303 K) value, demonstrating significant anti-thermal-quenching behavior. In contrast, commercial BGO and CsI:Tl scintillators exhibit RL intensities dropping to approximately 1% under identical conditions. These results establish the potential of Tb3+-doped glass scintillators for high-temperature X-ray imaging and provide a strategic framework for developing thermally robust scintillating materials.
1. Introduction
High-temperature environments, such as those encountered in industrial flaw detection and deep-earth oil exploration, demand scintillators that maintain high efficiency and stability under thermal stress. Conventional scintillators like BGO and CsI:Tl suffer severe thermal quenching, with RL intensities dropping to approximately 1% at elevated temperatures, rendering them unsuitable for such applications. Emerging metal halide perovskites offer high RL intensity but suffer from poor thermal and chemical stability, limiting their practical deployment.
This work addresses the bottleneck by engineering Tb3+-doped oxyfluoride glass scintillators. The glass host provides cost-effectiveness, high transparency, and compositional tunability, while the low-phonon-energy environment and structural densification enhance luminescence efficiency. Thermally enhanced energy transfer from Ce3+ to Tb3+ further boosts RL intensity at high temperatures, resulting in a material that not only outperforms commercial scintillators in RL intensity but also exhibits unprecedented anti-thermal-quenching behavior, enabling high-resolution X-ray imaging at temperatures up to 633 K.
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LI Lianjie, CHEN Junyu, HE Guanlin, GUO Jiajia, WADHWA Abhishek, DU Jincheng, QIAO Xvsheng, CHEN Daqin, GUO Hai (2026). Anti-Thermal-Quenching Radioluminescence and High-Temperature X-ray Imaging of Tb3+-Doped Glass Scintillators. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3677-9
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Frequently Asked Questions
What is the mechanism behind the anti-thermal-quenching behavior observed in the Tb3+-doped glass scintillators?
The anti-thermal-quenching is attributed to thermally enhanced energy transfer from Ce3+ to Tb3+, combined with the low-phonon-energy oxyfluoride glass host and increased structural densification. These factors reduce non-radiative losses and promote efficient energy transfer at elevated temperatures, leading to an RL intensity increase to 143% at 633 K relative to room temperature.
How does the imaging resolution of 24 lp mm−1 compare to commercial scintillators, and what implications does this have for high-temperature X-ray imaging?
The achieved resolution of 24 lp mm−1 is among the highest reported for glass scintillators and surpasses many commercial screens. This high resolution, combined with thermal stability, enables detailed non-destructive inspection of components in high-temperature environments, which is critical for industrial flaw detection and oil exploration.
What are the potential scalability and cost advantages of these glass scintillators compared to single-crystal or ceramic alternatives?
Glass scintillators offer cost-effective, large-scale fabrication due to their amenability to conventional glass processing techniques. The oxyfluoride glass host is chemically inert and can be produced in various shapes and sizes, reducing manufacturing costs compared to single-crystal growth or ceramic sintering, which are often expensive and limited in size.
What is the optical transmittance of the scintillator, and how does it affect the overall performance in X-ray imaging systems?
The scintillator exhibits an optical transmittance exceeding 88% at 542 nm, which is the emission wavelength of Tb3+. High transmittance minimizes light loss and ensures efficient collection of scintillation photons, directly contributing to the high imaging resolution and sensitivity.
How does the RL intensity of 350% relative to BGO translate into practical sensitivity improvements for radiation detection?
An RL intensity 3.5 times that of BGO means that for a given X-ray dose, the glass scintillator produces significantly more visible photons, enhancing the signal-to-noise ratio and allowing for lower detection limits or faster imaging. This is particularly advantageous in high-temperature environments where conventional scintillators fail.
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