Long-lived Mn2+ emission in nanocrystalline ZnS:Mn2+
Long-lived Mn2+ emission in nanocrystalline ZnS:Mn2+
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DOI：
10.1103/physrevb.58.r15997
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发表时间：
1998-12-15
影响因子：
3.7
通讯作者：
Meijerink, A
中科院分区：
文献类型：
--
作者：
Bol, AA;Meijerink, A
最近有报道称，掺杂半导体纳米颗粒既能产生高的发光效率，又能显著缩短发光寿命，这表明掺杂半导体纳米颗粒形成了一类新的发光材料，具有广泛的应用前景。根据寿命测量和时间分辨光谱，我们得出结论：Mn2+的发射并没有像先前报道的那样，随着颗粒尺寸的减小而显著缩短衰减时间。纳米晶ZnS：Mn2+的发光确实具有较短的衰减时间(约100 ns)，但也表现出较长的ms范围衰减时间。这种短的衰变时间归因于与缺陷相关的发射，而不是其他作者所认为的由Mn2+杂质的T-4(1)-(6)A(1)跃迁引起的衰变。Mn2+的T-4(1)-(6)A(1)跃迁的“正常”衰变约为1.9ms。根据我们的观察，我们得出的结论是，掺杂的半导体纳米颗粒并没有形成一种新的发光材料，结合了高效率和短(Ns)的衰减时间。[S0163-1829(98)52038-6]。
Recently, it has been reported that doped semiconductor nanoparticles can yield both high luminescence efficiencies and a spectacular lifetime shortening, which suggests that doped semiconductor nanoparticles form a new class of luminescent materials for various applications. From lifetime measurements and time-resolved spectroscopy we conclude that the Mn2+ emission does not show a spectacular shortening of the decay time upon decreasing particle size as reported earlier. The luminescence of nanocrystalline ZnS:Mn2+ indeed has a short decay time (similar to 100 ns), but also shows a long ms range decay time. The short decay time is ascribed to a defect-related emission of ZnS, and is not from the decay of the T-4(1)-(6)A(1) transition of the Mn2+ impurity as suggested by other authors. The T-4(1)-(6)A(1), transition of the Mn2+ has a ''normal'' decay of about 1.9 ms. Based on our observations, we conclude that doped semiconductor nanoparticles do not form a new class of luminescent materials, combining a high efficiency with a short (ns) decay time. [S0163-1829(98)52038-6].