Doped semiconductor nanoparticles - a new class of luminescent materials?
Doped semiconductor nanoparticles - a new class of luminescent materials?
复制标题
DOI：
10.1016/s0022-2313(99)00336-1
复制
发表时间：
2000-05-01
影响因子：
3.6
通讯作者：
Meijerink, A
中科院分区：
文献类型：
--
作者：
Bol, AA;Meijerink, A
早在五年前就有报道称，纳米晶ZnS：Mn2+可以产生高的发光效率和惊人的寿命缩短，这表明掺杂的半导体纳米颗粒形成了一类新的发光材料，用于各种应用。根据寿命测量和时间分辨光谱，我们得出结论：纳米晶ZnS：Mn2+的发射实际上并没有随着颗粒尺寸的减小而显著缩短。纳米晶ZnS：Mn2+的发光确实表现出较短的衰减时间分量(约100 ns)，但也有较长的(Ms)衰减时间。较短的衰变时间归因于与缺陷相关的发射，而不是由于Mn2+杂质的T-4(1)-(6)A(1)跃迁的衰变。Mn2+的T-4(1)-(6)A(1)相变的“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。(C)2000 Elsevier Science B.V.保留所有权利。
Five years ago it was reported that nanocrystalline ZnS:Mn2+ can yield both high luminescence efficiencies and a spectacular lifetime shortening, which suggested 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 of nanocrystalline ZnS:Mn2+ does in fact not show a spectacular shortening of the decay time upon decreasing particle size. The luminescence of nanocrystalline ZnS:Mn2+ indeed shows a short decay time component( similar to 100 ns), but also a long (ms) decay time is observed. 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. 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. (C) 2000 Elsevier Science B.V. All rights reserved.