Hypsochromic shift
（重定向自Hypsochromic effect）
Hypsochromic shift (from ancient greek ὕψος (upsos) "height") is a change of spectral band position in the absorption, reflectance, transmittance, or emission spectrum of a molecule to a shorter wavelength (higher frequency). Because the blue color in the visible spectrum has a shorter wavelength than most other colors, this effect is also commonly called a blue shift.