A type of luminescence. When a substance is excited in some way and continues to emit light for a long time after the excitation is stopped, it is called phosphorescence. While the average lifetime of fluorescence is about 10-9 seconds, phosphorescence can reach several seconds. However, this distinction is not clear-cut, and the two are often defined according to the mechanism of emission. In other words, fluorescence is the light emitted when electrons in a substance are excited to an excited state and then immediately return to their original ground state, while phosphorescence is the light emitted when the electrons move to a metastable intermediate state and then return to the ground state. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ルミネセンスの一種。物質をなんらかの方法で励起し,その励起を中止した後に長時間にわたって発光する場合,これをリン光という。蛍光が10-9秒程度の平均寿命であるのに対して,リン光は数秒に達することもある。ただし,このような区別は明確なものではなく,発光の機構によって定義することも多い。すなわち,物質内の電子が励起状態へ励起された後,直ちに元の基底状態へもどるときに放出する光が蛍光であり,リン光はいったん準安定な中間状態へ移り,その後に基底状態へもどるときに放出される光である。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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