Development of quantum cutting phosphor materials for efficacy improvement of mercury-free fluorescent lamps

为了提高无汞光源的发光效率，研究了一种特殊荧光材料的量子切割过程，即单光子激发产生两个可见光子。在优化原料配比和烧结条件的过程中，发现烧结态量子剪裁荧光粉的手形结构中存在自陷激发带（STE），降低了其量子效率。具有所开发的磷光体（SrAl 12 O 19：Pr 3+）的DBD灯显示高色温（7360 K）发射，这显示了作为白色发光磷光体的实际应用的可能性。具有Pr 3+掺杂剂的另一种基质晶体（SrAl 2 O 4）显示UV-C（252 nm）发射，其将用于灭菌或清洁目的。

For the purpose of efficacy improvement of mercury-free light sources, the authors focused on quantum cuttingprocess in a special phosphor materials, in which two visible photons were emitted by one-photon excitation. During optimization of the mixtures of raw materials and sintering conditions, it is found that existence of STE (self-trapped excitation) band in the hand structure of sintered quantum cutting phosphor lowers its quantum efficiency. A Xe DBD lamp with the developed phosphor (SrAl12O19:Pr3+) showed high color temperature (7360 K) emission, which showed a possibility of a practical use as a white light emission phosphor. Another host crystal (SrAl2O4) with Pr3+dopant showed UV-C (252 nm) emission, which will be utilized for sterilization or cleaning purpose.