Determine PL quenching dynamics of triethylamine on CdSe QDs with...

Question

# Determine PL quenching dynamics of triethylamine on CdSe QDs with...

Determine PL quenching dynamics of triethylamine on CdSe QDs with Stern-Volmer

analysis

Procedure:

1. Prepare 22 ml of CdSe QDs solution with a concentration of 5 μM in hexanes.

2. Divide the above solution to seven samples, each consisting of 3 mL CdSe solution.

3. To each vial with the CdSe solution, add the quencher, 0, 5, 10, 20, 30, 40, and 50 μL of NEt3.

The obtained solutions are kept in dark for ~1 hour. Note: NEt3 d = 0.726g/mL, M.W. =

101.19g/mol.

4. Measure the photoluminescence (PL) of the samples prepared in step 3 and record the PL

intensity.

5. Plot the ratios of PL intensities between the sample with no NEt3 addition and each sample

(PL0/PL) as a function of the concentration of NEt3. Fit the curve with a linear relationship to

obtain the Stern-Volmer quenching constant Kq = kqτ (M-1).

6. Using the time-resolved photoluminescence to measure the decay of the PL of the CdSe stock

solution with 0 NEt3 addition. Fit the decay curve with a single exponential decay function to

obtain the exciton

I need an explanation for number 5.  I have the graph data. can you explain how to plot it? How to figure out the concentration?

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## Step-by-step explanation

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