红移效应是多普勒效应（Doppler Effect）的一个方面。当一个波源离你远去时，你接受到他的频率降低的现象叫红移。相对的当他向你靠近，接受到的频率升高的现象叫蓝移。大自然七色光中频率最低的光是红光，频率最高的光是蓝紫光，所以叫“红移”和“蓝移”。
广义相对论预言这种光的波长会因这些星系的质量而有少量的偏移，这种效应称为引力红移。
General relativity predicts that the wavelength of this light will be shifted by a small amount due to the galaxies' mass, in an effect called gravitational redshift.
在氮气和空气中退火时，随退火温度升高前者表现为红移而后者表现为蓝移，这归属于量子尺寸效应。
The optical absorption edges red-shift along with the increase of annealing temperature under nitrogen and blue-shift under air were observed, which can be attributed to the quantum size effect.
纳米硅的发光峰随退火温度升高而红移呈量子尺寸效应。
As the annealing temperature increases the red shift of PL peak from nc si shows the quantum size effect.
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