fluorescence
fluorescence — noun
1. a bright, visible glow given off by certain materials when they take in energy f
a bright, visible glow given off by certain materials when they take in energy from a shorter-wavelength light source, such as ultraviolet radiation — the glow stops almost as soon as the source is removed
Cyrus was amazed by the bright green fluorescence of the mineral under ultraviolet light.
visible light + UV source collocation
Beatrix watched the jellyfish's fluorescence glow a vivid blue in the dark seawater.
marine organism producing fluorescence
Under a UV lamp, Élise observed the orange fluorescence coming from her rock sample.
A faint red fluorescence appeared on the ticket when Lan held it under the black light.
The fluorescence from some corals comes from tiny algae living inside their bodies.
- luminescence
broader term covering any cold-light emission not caused by heat; fluorescence is one type of luminescence
- phosphorescence
similar but delayed emission that continues after excitation stops, unlike fluorescence which is immediate and brief
- bioluminescence
light produced by living organisms through a chemical reaction, not by absorbing external light
文法句型
fluorescence + of + noun phrase
noun + fluorescence
用法筆記
Uncountable; used mainly in scientific or technical contexts. The effect ceases within nanoseconds of removing the energy source — this distinguishes fluorescence from phosphorescence, which continues to glow.
常見錯誤
2. the physical property of a substance that causes it to absorb short-wavelength r
the physical property of a substance that causes it to absorb short-wavelength radiation and immediately release it as longer-wavelength visible light
Joshua tested the fluorescence of several diamonds by shining a UV torch on them.
diamond fluorescence under UV test
The strong fluorescence of this plastic makes it useful for safety signs in dark buildings.
practical application in safety materials
Scientists at the lab use fluorescence measurements to identify different chemical compounds.
Kemi chose a highlighter pen with strong fluorescence to make the text stand out.
- luminescence
broader property of emitting light without heat; fluorescence is a specific subtype with immediate emission
- phosphorescence
similar light-emitting property but with a delayed, longer-lasting glow after the source is removed
文法句型
fluorescence + of + noun
noun + shows / exhibits + fluorescence
用法筆記
Uncountable; describes a material characteristic rather than the light itself. Frequently appears in materials science and analytical chemistry contexts: 'the fluorescence of [substance]'.