Directional Fluorescence Spectral Narrowing in All-Polymer Microcavities Doped with CdSe/CdS Dot-in-Rod Nanocrystals
Directional Fluorescence Spectral Narrowing in All-Polymer Microcavities Doped with CdSe/CdS Dot-in-Rod Nanocrystals
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DOI：
10.1021/acsphotonics.7b00330
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发表时间：
2017-07-01
期刊：
影响因子：
7
通讯作者：
Comoretto, Davide
中科院分区：
文献类型：
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作者：
Manfredi, Giovanni;Lova, Paola;Comoretto, Davide
我们报告的高光学质量的全聚合物平面微腔嵌入核壳点在棒的CdSe/CdS纳米晶体的荧光特性。适当调谐的微腔允许纳米晶体荧光光谱的10倍锐化，导致带宽从24 nm减小到2.4 nm，这对应于大于250的品质因数。测量到5倍峰值光致发光强度增强，而发射光子的总数减少。时间分辨的光致发光和量子产率的微腔和合适的参考显示存在两个衰变相关的差异在微腔的尺寸分布。当纳米晶体嵌入微腔中时，较慢的衰减速率变得更快，这被分配给发射光谱与腔模重叠的较长纳米棒。相反，短寿命组分，这是分配给较短的纳米棒的杂质，保持不受微腔。
We report on the fluorescence properties of high optical quality all-polymer planar microcavities embedding core shell dot-in-rod CdSe/CdS nanocrystals. Properly tuned microcavities allow a 10-fold sharpening of the nanocrystals fluorescence spectrum, resulting in a reduction of the bandwidth from 24 to 2.4 nm, which corresponds to a quality factor larger than 250. A 5-fold peak photoluminescence intensity enhancement is measured, while the overall number of emitted photons is reduced. Time-resolved photoluminescence and quantum yield for microcavities and suitable references show the presence of two decays related to differences in nanocrystal size distribution. The slower decay rate, which becomes faster when the nanocrystals are embedded into the microcavity, is assigned to longer nanorods with emission spectrally overlapped to the cavity mode. Conversely, the short-living component, which is assigned to an impurity of shorter nanorods, remains unaffected by the microcavity.