1：Experimental Design and Method Selection:

The study involved the synthesis of Yb3+ and Ho3+ doped lead tungstate nanophosphors using the hydrothermal method at 190°C for 18 hours, maintaining a pH of 9. The samples were characterized using XRD, FTIR, HRTEM, and photoluminescence studies were conducted using a spectroflurophotometer.

2：The samples were characterized using XRD, FTIR, HRTEM, and photoluminescence studies were conducted using a spectroflurophotometer. Sample Selection and Data Sources:

2. Sample Selection and Data Sources: The samples were prepared with varying concentrations of Ho3+ ions to study the effect on emission properties. The compositions of the synthesized doped samples are detailed in the paper.

3：List of Experimental Equipment and Materials:

Equipment used includes X-ray diffractometer (BRUKER D8 Advance ECO), FTIR spectrometer (Shimadzu IR Affinity 1), HRTEM (JEOL JEM 2100 HR with EELS), and spectroflurophotometer (FLSP-980). Materials used include Lead Nitrate, Sodium tungstate, Yb2O3, Ho2O3, and Ammonium hydroxide.

4：0). Materials used include Lead Nitrate, Sodium tungstate, Yb2O3, Ho2O3, and Ammonium hydroxide. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: The synthesis involved the reaction of Pb(NO3)2 and Na2WO4, followed by doping with Yb2O3 and Ho2O3. The samples were filtered, dried, and then characterized.

5：The samples were filtered, dried, and then characterized. Data Analysis Methods:

5. Data Analysis Methods: The upconversion luminescence emission spectra and time-resolved photoluminescence were analyzed to understand the emission properties and mechanisms.