研究目的
Investigating the structural, photoluminescence, and thermoluminescence properties of novel Li+ co-activated lanthanum oxide doped with Dy3+ and Eu3+ for potential applications in radiation dosimetry and persistent luminescence.
研究成果
The microwave-assisted solution combustion synthesis successfully produced La2O3 nanophosphors co-activated with Li+ and doped with Dy3+ or Eu3+, maintaining the hexagonal crystal structure. Photoluminescence studies revealed characteristic emissions from Dy3+ and Eu3+ ions, with enhanced intensity. Thermoluminescence analysis showed that La2O3:Dy3+, Li+ has a single glow peak suitable for persistent luminescence applications, while La2O3:Eu3+, Li+ exhibits multiple stable peaks making it promising for medium and high-dose radiation dosimetry. The repeatability and fading behavior support their potential use in practical applications, with future studies needed to optimize and test in real environments.
研究不足
The study is limited to specific dopant concentrations (1 mol% Dy3+ or Eu3+, 10 mol% Li+) and synthesis conditions; other concentrations or methods might yield different results. Li+ was not detectable by EDS due to its light atomic weight, limiting compositional analysis. The TL measurements were conducted under specific conditions (e.g., beta radiation, N2 atmosphere), and results may vary with other radiation types or environments. The potential for application in dosimetry requires further validation in real-world scenarios.
1：Experimental Design and Method Selection:
The study employed microwave-assisted solution combustion synthesis to prepare La2O3 nanophosphors doped with Dy3+ and Eu3+ and co-activated with Li+. This method was chosen for its efficiency in producing nanomaterials. Characterization techniques included X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), diffuse reflectance spectroscopy, photoluminescence (PL) spectroscopy, and thermoluminescence (TL) measurements to analyze structural, morphological, and optical properties.
2：Sample Selection and Data Sources:
Samples were synthesized using lanthanum nitrate hexahydrate, glycine as fuel, and dopant salts (europium nitrate hexahydrate, dysprosium nitrate pentahydrate, lithium nitrate) to form La2O3:1 mol% Dy3+, 10 mol% Li+ and La2O3:1 mol% Eu3+, 10 mol% Li+ compounds. All chemicals were ACS grade from Sigma-Aldrich. Deionized water was used for solution preparation.
3：List of Experimental Equipment and Materials:
Equipment included a Milestone PyroXL Microwave Ashing Furnace for synthesis, Thermolyne 1300 furnace for annealing, Rigaku SmartLab X-ray diffractometer for XRD, JEOL JSM-7800F FE-SEM with EDS for morphology and composition, PerkinElmer Lambda 1050 UV/VIS/NIR for diffuse reflectance, Jobin-Yvon Horiba Fluorolog 3 with xenon lamp for PL, and Ris? TL/OSL reader model TL/OSL-DA-20 with beta radiation source for TL measurements. Materials included china dish, hot plate, agate mortar, and carbon tape for sample mounting.
4：Experimental Procedures and Operational Workflow:
The synthesis involved preparing a 0.25 M lanthanum nitrate solution, adding glycine and dopant salts, stirring magnetically, evaporating water at 200°C, combusting at 500°C, cooling, crushing the powder, and annealing at 900°C for 2 hours. Characterization steps included XRD for phase identification, SEM for morphology, EDS for composition, diffuse reflectance for absorption, PL for emission properties, and TL for radiation response after beta irradiation at 0.0128 Gy/s dose rate.
5：25 M lanthanum nitrate solution, adding glycine and dopant salts, stirring magnetically, evaporating water at 200°C, combusting at 500°C, cooling, crushing the powder, and annealing at 900°C for 2 hours. Characterization steps included XRD for phase identification, SEM for morphology, EDS for composition, diffuse reflectance for absorption, PL for emission properties, and TL for radiation response after beta irradiation at 0128 Gy/s dose rate.
Data Analysis Methods:
5. Data Analysis Methods: XRD data were compared with standard JCPDS files. SEM and EDS data were analyzed for morphology and elemental composition. Diffuse reflectance spectra were used to identify absorption bands. PL spectra were analyzed for emission transitions. TL data were analyzed for glow curves, dose response, repeatability, fading, and activation energy using methods like initial rise and variable heating rate.
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