Bathochromic shift iş a change of spectral band position in the absorption, reflectance, transmittance, or emission spectrum of a molecule to a longer wavelength (lower frequency). Because the red color in the visible spectrum has a higher wavelength than most other colors, this effect iş also commonly called a red shift, although this usage iş considered informal, and has no relation to Doppler shift or other wavelength-ındependent meanings of redshift. This usage iş often found in the scientific literatüre
Solvent relaxation lowers the energy of the first singlet excited state and shifts bathochromically the emission wavelength.
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Definition of bathochromic in English English dictionary