研究目的
To synthesize high-concentration Eu3+-doped NaYb(MoO4)2 phosphors for use as red-emitting sources in LEDs that match the absorption of phytochrome PR for plant growth control and to study their temperature sensing capabilities.
研究成果
The NaYb(MoO4)2:Eu3+ phosphors with 50% doping concentration exhibit strong red emission matching PR absorption, high color purity (95.32%), good thermal stability, and effective temperature sensing with a maximum sensitivity of 0.01136 K^-1 at 498 K, making them promising for dual-function applications in plant growth LEDs and temperature monitoring.
研究不足
The study is limited to specific synthesis conditions and doping concentrations; potential areas for optimization include scalability for industrial applications and long-term stability testing of the LED devices in real plant growth environments.
1：Experimental Design and Method Selection:
The phosphors were synthesized using a hydrothermal method followed by calcinations, based on previous work with optimized conditions (Yb(NO3)3 to Na2MoO4 ratio of 1/3, pH=5). Theoretical models include the Blasse equation for critical distance and Dexter's theory for energy transfer mechanisms.
2：5). Theoretical models include the Blasse equation for critical distance and Dexter's theory for energy transfer mechanisms.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Samples with Eu3+ doping concentrations of 30%, 40%, 50%, and 60% were prepared using high-purity chemicals (Yb(NO3)3 99.99%, Na2MoO4 99%).
3：99%, Na2MoO4 99%).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes Rigaku-Dmaxan X-ray diffractometer (XRD) with Cu Kα radiation, Andor Shamrock SR-750 fluorescence spectrometer with Xe-lamp, HAAS 2000 photoelectric measuring system, and an iron sample cell with resistive heating for temperature control. Materials include Yb(NO3)3, Na2MoO4, Eu3+ dopants, silicone resin, and blue InGaN LED chips.
4：Experimental Procedures and Operational Workflow:
Synthesis involved hydrothermal reaction and calcination. Characterization included XRD for phase analysis, PL and PLE spectra measurement at room and elevated temperatures (323-573 K), LED fabrication by coating phosphors on blue chips, and EL spectra measurement at 5 mA bias current.
5：Data Analysis Methods:
Data analysis involved calculating critical distance using Blasse equation, determining energy transfer mechanism via log(I/x) vs. log(x) plots, CIE coordinates and color purity calculation, thermal stability assessment with activation energy fitting, and temperature sensitivity analysis using intensity ratios.
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