| 摘要 |
A fluorescent lamp of an EEFL-type with optimized efficiency is provided to enhance efficiency thereof by using a glass or a coating material for emitting secondary electrons. A fluorescent lamp(100) includes a glass(110) having low electronic affinity of Wa<6eV, desirably <5eV, more desirably 0eV<Wa<5eV, particularly and desirably 0eV<Wa<4eV, and more particularly and desirably 0eV<Wa<3eV. The glass includes one or more dopants which are selected from a first group including BaO, CaO, MgO, SrO, MgF2, AlN, Al2O3, and/or Mg1-x-ySrxCayO or a second group including La2O3, Bi2O3, BaO and/or PbO. The dopants selected from the first group are 3 to 70 weight percent, desirably 5 to 60 weight percent, and more desirably 10 to 60 weight percent. The dopants selected from the second group are 3 to 80 weight percent, desirably 5 to 75 weight percent, and more desirably 10 to 65 weight percent. The glass includes an internal coating material having low electronic affinity of Wa<6eV, desirably <5eV, more desirably 0eV<Wa<5eV, particularly and desirably 0eV<Wa<4eV, and more particularly and desirably 0eV<Wa<3eV. The internal coating material includes one or more dopants which are selected from a first group including BaO, CaO, MgO, SrO, MgF2, AlN, Al2O3, and/or Mg1-x-ySrxCayO or a second group including La2O3, Bi2O3, BaO and/or PbO. The dopants selected from the first group are 3 to 70 weight percent, desirably 5 to 60 weight percent, and more desirably 10 to 60 weight percent. The dopants selected from the second group are 3 to 80 weight percent, desirably 5 to 75 weight percent, and more desirably 10 to 65 weight percent.
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