1：Experimental Design and Method Selection

The study involved the design and synthesis of five boron dipyrromethene dyes with aromatric-amine-cored structures. Their photophysical properties were analyzed in various solvents, and ASE performance was evaluated in toluene. Emission turn-on sensing towards Hg(II) was also investigated.

2：Sample Selection and Data Sources

The dyes were synthesized using starting compounds obtained from Aladdin Chemical Corporation. Absorption and emission spectra were measured using a Hitachi F-7000 fluorescence spectrophotometer and a Shimadzu UV-3101PC spectrophotometer. ASE spectra were recorded using an Ocean Optics Maya2000 Pro Fiber Optic spectrometer.

3：List of Experimental Equipment and Materials

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4：Experimental Procedures and Operational Workflow

The dyes were synthesized by reacting aromatic aldehydes with 2,4-dimethyl pyrrole. ASE measurement involved dissolving the dyes in solutions, sealing them into quartz cells, and exciting them with a Nd:YAG laser. Emission quantum yield was measured using a reference method with fluorescein as a standard.

5：Data Analysis Methods

Emission quantum yield was calculated using a reference method. ASE efficiency and slope efficiency were determined based on the ratio of ASE output intensity to pumping laser intensity and the fitted slope value of ASE output energy against pumping energy, respectively.