A Novel Approach to the Fabrication of CdSe Quantum Dots in Aqueous Solution: Procedures for Controlling Size, Fluorescence Intensity, and Stability over Time

Table 1

Spectral characteristics of the CdSe nanoparticles from two different experiments performed under the same experimental conditions (Experiment A: bold; Experiment B, 23 h later: notbold).

Time	𝐴	𝜆abs	𝑑	FI	𝜆ex	𝜆em
1 hour	2.503	362	2.2	27.64	395	492	A
	2.489	360	2.2	22.52	401	491	B
12 days	2.826	388	2.7	168.64	425	497	A
	2.853	393	2.7	172.73	425	497	B
62 days	2.937	398	2.8	94.91	432	502	A
	2.940	402	2.8	113.28	438	505	B

𝐴: absorption; 𝜆_abs: absorption wavelength in nm; 𝑑: mean diameter in nm; FI: fluorescence intensity in arbitrary units; 𝜆_ex: excitation wavelength in nm; 𝜆_em: emission wavelength in nm.