锶铝酸盐磷光体中相位依赖性阱深度控制及持续发光
December 5th, 2025
本研究探讨了两种持久发光陶瓷的标准光学测量：SAO-B（蓝色）和SAO-G（绿色），如热释光（TL）和持久发光（PersL）。通过控制电子阱深度，这项工作创新了“温度分辨”和“时间分辨”动态防伪方法。
我的研究探索持久性发光材料，如锡锶铝酸盐奇异物，以及该结构如何实现生物成像和高级格斗。该场的过程显示了光和温度后的颜色调谐，或单一持续发光荧光粉成分产生的温度分辨发光。首先，称重SAO-B和SAO-G粉末，并以3.5吨单轴压力压制五分钟，形成颗粒。
确保每个标本形状均匀，质量约为120毫克，直径约10毫米，厚度约1毫米。将样品加热至350开尔文10分钟，以去除浅层或表面的存水器。然后将样本在480开尔文温度下孵育10分钟，以消除更深的陷阱。
现在，在样品架表面涂抹一层薄均匀的银浆，均匀涂抹以确保牢固接触。将样品放在样品架上，等待10到15分钟，直到膏体完全干燥，然后用指定的螺丝安装样品架，确保每个螺丝都处于正确的匹配位置。以横向拧紧螺丝，重复三次以均匀施加压力。
将四面开孔的内腔插入已装样品。接着，将外部腔室覆盖在内腔体上，封闭的窗户朝上以实现紫外线可见激发，并确保阀门在整个过程中保持关闭。在保持阀门关闭的同时打开真空泵。
监控泵指示器。观察右侧灯从红灯变绿灯，左灯从黄灯变红灯，表示压力降至1乘以10倍的负3毫巴的幂次方以下，然后打开阀门进入腔室。接上光纤电缆，调整以最佳收集发出的光。
用黑色毯子覆盖整个装置，阻挡散射光和背景激发。接下来，在启动低温恒温器和压缩机冷却前，先打开水源。打开温度控制器，把加热器范围设为50瓦，目标温度为10开尔文。
使用显示的菜单，并确认设置两遍。现在，让系统冷却直到达到目标温度。继续抽取以保持样品架周围的真空。
对于热发光，可以用紫外线或可见光激发样品。激发后，以每分钟10开尔文的受控速率将样品温度提升至目标温度（如470开尔文），并随着温度升高持续记录光度和光谱。最后，当系统达到室温后，拆开腔室并取出样品架。
在275纳米的紫外激发时，SAO-B在490纳米处表现出持续的发光峰值，而SAO-G在520纳米处出现峰值，分别证实了它们的蓝色和绿色发射。SAO-B的衰变时间比SAO-G更长，且遵循相同的紫外预激发。SAO-B表现出以350开尔文为中心的热发光峰值，而SAO-G则在290开尔文和320开尔文分别出现两个明显峰值，表明陷阱深度分布更为宽广。
一种由SAO-B和SAO-G陶瓷制成的双色防伪图案分别在紫外预激发后，分别发出蓝色和绿色，持续超过一小时。在温度分辨的防伪应用中，标有Chimie的绿色发光显著下降，约为100摄氏度，而标有Paris的蓝色仍可见。在约150摄氏度时，标有Chimie的绿色发射无法区分，只有标有蓝色的Paris继续发出。
我识别出晶体面控制、陷阱深度，使蓝色或绿色持续发光且具有明显的DQ行为。这项工作解决了缺乏动态时间或温度分辨的持续发光问题。我未来的研究将聚焦于海豚在可调调寿命、色彩和生物医学应用中的新型结构。
Overview
This study investigates persistent luminescent (PersL) materials, specifically two strontium aluminate ceramics: Sr4Al14O25:Eu2+, Dy3+, B3+ (SAO-B, blue-emitting) and SrAl2O4:Eu2+, Dy3+, B3+ (SAO-G, green-emitting). The research focuses on their synthesis, thermoluminescence (TL), persistent luminescence properties, and applications in dynamic anti-counterfeiting technologies. The methodology provides a reference for optimizing persistent phosphors for security and display applications.
Key Study Components
Area of Science
- Materials Science
- Optoelectronics
- Anti-counterfeiting Technology
Background
- Persistent luminescent materials emit light long after excitation, making them valuable for visualization, signaling, bioimaging, and anti-counterfeiting.
- Achieving both long emission duration and stable luminescence is challenging.
- Strontium aluminate phosphors are known for their strong and persistent afterglow properties.
- Dynamic anti-counterfeiting requires materials with tunable and resolvable emission characteristics.
Purpose of Study
- To characterize and compare the persistent luminescence and thermoluminescence properties of SAO-B and SAO-G ceramics.
- To demonstrate dynamic, temperature- and time-resolved anti-counterfeiting applications using these materials.
- To provide a methodological reference for optimizing persistent phosphors for advanced security and display uses.
Methods Used
- Preparation of SAO-B and SAO-G powders, pressing into pellets under uniaxial pressure.
- Thermal treatment to remove shallow and deep traps (heating at 350 K and 480 K).
- Sample mounting with silver paste and vacuum chamber setup for optical measurements.
- Excitation with ultraviolet or visible light, followed by controlled temperature ramping for thermoluminescence analysis.
- Recording emission spectra and decay profiles under various conditions.
- Demonstration of anti-counterfeiting patterns using dual-color emission and temperature-resolved luminescence.
Main Results
- SAO-B (blue) exhibits deeper traps and longer decay times compared to SAO-G (green), which shows stronger initial emission intensity.
- Upon UV excitation, SAO-B emits at 490 nm and SAO-G at 520 nm, confirming their respective blue and green emissions.
- Thermoluminescence analysis revealed SAO-B has a peak at 350 K, while SAO-G has peaks at 290 K and 320 K, indicating broader trap depth distribution in SAO-G.
- Dual-color anti-counterfeiting patterns using SAO-B and SAO-G ceramics maintained visible emission for over one hour after UV excitation.
- Temperature-resolved anti-counterfeiting demonstrated selective fading of green emission at higher temperatures, leaving blue emission visible.
Conclusions
- Crystal structure and trap depth engineering enable tunable persistent luminescence in strontium aluminate ceramics.
- The developed methodology allows for dynamic, time- and temperature-resolved anti-counterfeiting applications.
- This work provides a foundation for further research into tunable lifetime, color, and biomedical applications of persistent phosphors.
Frequently Asked Questions
Executive Industry Relevance
Persistent luminescent strontium aluminate phosphors with tunable trap depths offer new opportunities for advanced visualization, signaling, and anti-counterfeiting in biopharma R&D. The ability to control emission duration and stability through phase engineering supports the development of robust, dynamic labeling and tracking systems. These materials enable precise, time- and temperature-resolved outputs that can enhance security and traceability in regulated environments.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Supports the development of persistent luminescent markers for biological tracking and imaging.
- Enables mechanistic de-risking by providing stable, quantifiable optical signals.
- Facilitates the validation of dynamic labeling strategies in complex systems.
Screening & Assay Development
- Provides standardized, reproducible luminescent outputs for assay calibration.
- Enables multiplexed detection through dual-color and temperature-resolved emission.
- Improves screening reliability by offering long-lasting, quantifiable readouts.
Translational & Preclinical Research
- Aligns with translational biomarker strategies by enabling persistent, non-invasive imaging.
- Supports continuity from discovery to preclinical validation with robust optical tracking.
- Reduces risk in preclinical studies by providing stable, interpretable luminescent signals.
Pipeline & Workflow Integration
Phase-engineered strontium aluminate phosphors integrate into the discovery-to-preclinical continuum as persistent optical markers for dynamic labeling, anti-counterfeiting, and imaging workflows.
- Discovery Biology: Enables hypothesis testing of labeling strategies and pathway tracing using persistent emission.
- Screening: Provides reproducible, quantitative luminescent outputs for assay development and validation.
- Analytics: Delivers time- and temperature-resolved emission profiles for comparative analysis across conditions.
- Translational Research: Supports biomarker continuity and traceability in preclinical models.
- Enterprise Reuse: Offers a reusable platform for dynamic labeling and security applications across R&D programs.
Operational & Enterprise Impact
- Scientific Value: Enhances predictive confidence and reduces ambiguity in optical tracking and labeling.
- Operational Value: Standardizes persistent luminescent outputs for scalable assay and imaging workflows.
- Strategic Value: Improves go/no-go decisions for labeling technologies and anti-counterfeiting solutions.
- Portfolio Impact: Enables risk-adjusted prioritization of dynamic labeling and security innovations.
Implementation Considerations
- Requires expertise in luminescent material synthesis and optical measurement.
- Needs access to controlled excitation sources and temperature-resolved analytical infrastructure.
- Demands cross-team standardization of emission measurement protocols.
- Adaptation may be needed for different biological or material systems.
- Emission duration and intensity must be matched to specific application requirements.
