Quantum dot (QD) materials, characterized as quasi-zero-dimensional nanocrystals, have garnered considerable attention due to their distinct optical properties arising from quantum size confinement effects, distinguishing them from bulk materials. Despite these advantages, challenges persist in achieving long-term stability and high luminescent efficiency. Addressing these issues, CdS QDs were successfully precipitated in a silicate glass matrix through a combination of melt-quenching and controlled crystallization techniques. Structural and morphological analyses confirmed the in-situ precipitation of CdS QDs with sizes < 20 nm within the glass matrix. Under 395 nm light excitation, the light color emitted from the CdS QD glass transitions from yellow to red, exhibiting an impressive internal quantum efficiency (IQE) of 67.14 %, notably surpassing other CdS QD glasses. Furthermore, the QD glass retained 85 % of its luminescent intensity at room temperature even when exposed to a high temperature of 150°C, demonstrating superior thermal stability compared to colloidal QDs. As a proof of concept, a full-spectrum luminescent white-light emitting diode (W-LED) device was encapsulated using the UV LED chip, CdS QD glass, BaMgAlO:Eu blue phosphor, and BaSiO:Eu green phosphor. This device exhibited suitable chromaticity coordinates of (0.3473, 0.3750), a correlated color temperature of 4996 K, and an impressive color rendering index of 92.5. Additionally, the X-ray imaging performance of CdS QD glass was assessed using a customized optical system, underscoring its promising potential in scintillation imaging applications such as non-destructive testing. In summary, the compositional optimization and controllable crystallization techniques employed in this study offer valuable insights for developing QD glasses with exceptional properties. The substantial potential benefits of CdS QD glasses are convincingly demonstrated through physical demonstration, particularly in the realms of W-LED lighting and X-ray scintillation imaging.

中文翻译：

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可调色高效光致发光多功能CdS量子点嵌入玻璃的成分与结晶工艺优化


量子点（QD）材料以准零维纳米晶体为特征，由于其量子尺寸限制效应产生的独特光学特性而引起了人们的广泛关注，这与块体材料不同。尽管有这些优点，但在实现长期稳定性和高发光效率方面仍然存在挑战。为了解决这些问题，通过熔融淬火和受控结晶技术的结合，CdS QD 成功地在硅酸盐玻璃基体中沉淀。结构和形态分析证实了玻璃基质内尺寸 < 20 nm 的 CdS QD 的原位沉淀。在395nm光激发下，CdS QD玻璃发出的光色从黄色转变为红色，表现出高达67.14%的内量子效率（IQE），明显优于其他CdS QD玻璃。此外，即使暴露在150°C的高温下，QD玻璃在室温下仍能保持85%的发光强度，与胶体QD相比表现出优异的热稳定性。作为概念验证，使用 UV LED 芯片、CdS QD 玻璃、BaMgAlO:Eu 蓝色荧光粉和 BaSiO:Eu 绿色荧光粉封装了全光谱发光白光发光二极管 (W-LED) 器件。该设备表现出合适的色品坐标（0.3473，0.3750），相关色温为4996K，显色指数高达92.5。此外，使用定制光学系统评估了 CdS QD 玻璃的 X 射线成像性能，突显了其在无损检测等闪烁成像应用中的巨大潜力。 总之，本研究中采用的成分优化和可控结晶技术为开发具有卓越性能的 QD 玻璃提供了宝贵的见解。通过物理演示，特别是在 W-LED 照明和 X 射线闪烁成像领域，令人信服地证明了 CdS QD 玻璃的巨大潜在优势。