1：Experimental Design and Method Selection:

The study involved the preparation of CdTe nanoneedles (NNs) and ZnSe quantum dots (QDs) through a colloidal synthesis method in an aqueous alkaline medium. The surface modification and attachment of nanostructures were achieved using a bifunctional ligand 3-mercaptopropionic acid (3-MPA). The band gap of the ZnSe QDs was varied by controlling their size to maximize the overlap between the absorption band of the CdTe NNs and the emission band of the ZnSe QDs.

2：Sample Selection and Data Sources:

The samples included CdTe NNs and ZnSe QDs with different sizes, prepared by varying the concentration of 3-MPA. The attachment of ZnSe QDs to CdTe NNs was achieved by mixing them in ethanol in a 1:2 molar ratio.

3：List of Experimental Equipment and Materials:

Chemicals used included CdCl2·2.5H2O, hydrazinium hydroxide, NaOH, Te powder, and 3-MPA. Equipment included SEM (model MIRA3, TESCAN), TEM (JEOL, JEM-2010), XRD (APD 3720), UV–Vis spectrophotometer (Shimadzu UV-1601), and a PicoQuant Fluo Time-300 spectrophotometer for SSPL and TRPL measurements.

4：5H2O, hydrazinium hydroxide, NaOH, Te powder, and 3-MPA. Equipment included SEM (model MIRA3, TESCAN), TEM (JEOL, JEM-2010), XRD (APD 3720), UV–Vis spectrophotometer (Shimadzu UV-1601), and a PicoQuant Fluo Time-300 spectrophotometer for SSPL and TRPL measurements. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: The synthesis of CdTe NNs and ZnSe QDs was followed by their attachment through 3-MPA linkage. The nanostructures were characterized using SEM, TEM, XRD, UV–Vis absorption, SSPL, and TRPL measurements.

5：Data Analysis Methods:

The data were analyzed to assess the photoinduced charge transfer (PCT) and F?rster resonance energy transfer (FRET) from the donor (QDs) to the acceptor (NNs). The overlap integral J(λ) and FRET efficiency were calculated to evaluate the energy transfer feasibility.