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(a) Excitation spectra of a CNDPASDB single crystal (monitored at different wavelength). Inset: the photograph of the crystal under fluorescence microscope and the chemical structure of CNDPASDB. (b) PL spectra acquired at variable excitation wavelength.
(a) Normalized light emission spectra of CNDPASDB crystals above the ASE threshold at varied excitation wavelength. (b) Relationship between the ASE emission wavelength and excitation wavelength in CNDPASDB organic crystal.
(a) ASE emission shift with varied excitation wavelength. Inset: off-resonant Raman spectrum of CNDPASDB crystals. (b) Proposed ASE and vibration relaxation competition model to explain the ASE line shift. VR: vibrational relaxation; IC: internal conversion; E: excitation; and SE: stimulated emission.
PL peak intensity of light emission as a function of the incident laser energy intensity at different wavelengths.
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