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sipei

金虫 (正式写手)

[交流] Fluorenscence 和 Luminescence

大家知不知道Fluorenscence 和 Luminescence之间的区别?
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bern

铁杆木虫 (著名写手)

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hzsch-1978(金币+2):谢谢你热心的虫友啊!
Fluorenscence是荧光
Luminescence 是磷光

区别是分子吸收光子后由激发态返回基态时跃迁的路径不一样。

荧光:10-7~10 -9 s,第一激发单重态的最低振动能级→基态;
磷光:10-4~10s;第一激发三重态的最低振动能级→基态;

荧光发射:电子由第一激发单重态的最低振动能级→基态( 多为 S1→ S0跃迁),发射波长为  ‘2的荧光; 10-7~10 -9 s 。

磷光发射:电子由第一激发三重态的最低振动能级→基态( T1 → S0跃迁);
         电子由S0进入T1的可能过程:( S0 → T1禁阻跃迁)
S0 →激发→振动弛豫→内转移→系间跨越→振动弛豫→ T1
         发光速度很慢: 10-4~100 s 。
      光照停止后,可持续一段时间。

给你一个ppt,里面介绍的比较多。
2楼2007-05-02 11:08:25
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ddjyg

铜虫 (小有名气)

Luminescence

Luminescence is light not generated by high temperatures alone. It is different from incandescence, in that it usually occurs at low temperatures and is thus a form of cold body radiation. It can be caused by, for example, chemical reactions, electrical energy, subatomic motions, or stress on a crystal. The following kinds of luminescence are known:

Chemoluminescence
    Bioluminescence
Crystalloluminescence
Electroluminescence
   Cathodoluminescence
Mechanoluminescence
   Triboluminescence
   Fractoluminescence
   Piezoluminescence
Photoluminescence
   Phosphorescence
   Fluorescence
Radioluminescence
Sonoluminescence
Thermoluminescence

Historically, radioactivity was first thought of as a form of "radioluminescence", although it is today considered to be separate since it involves more than electromagnetic radiation.

The process of coating dials, hands, scales and signs on, particularly, aviation and navigational instruments and markings with luminescent materials is known as luminising.

[ Last edited by ddjyg on 2007-5-2 at 13:06 ]
3楼2007-05-02 13:01:57
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