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首页> 外文期刊>RSC Advances >Effect of Cd0.5Zn0.5S shells on temperature-dependent luminescence kinetics of CdSe quantum dots
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Effect of Cd0.5Zn0.5S shells on temperature-dependent luminescence kinetics of CdSe quantum dots

机译：Cd0.5Zn0.5S壳层对CdSe量子点随温度变化的发光动力学的影响

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摘要

CdSe/Cd0.5Zn0.5S core/shell quantum dots (QDs) with high photoluminescence (PL) efficiency up to 85% were fabricated in organic solutions at high temperature via an anisotropic shell growth on CdSe nanorods. The core/shell QDs with PL peak wavelengths from green to red were obtained by controlling the size of the cores and the thickness of the array Cd0.5Zn0.5S shells. Both the cores and the core/shell QDs revealed narrow size distributions which resulted in narrow PL spectra. Green-emitting CdSe cores with a Se-rich surface revealed a long average lifetime of similar to 44 ns. After being coated with Cd0.5Zn0.5S shells, the average lifetime of QDs decreased drastically up to similar to 23 ns. The average decay time of the core/shell QDs depended on their shell thickness. The temperature-dependent PL in a temperature range of 293 to 393 K was investigated for CdSe cores and highly luminescent CdSe/Cd0.5Zn0.5S core/shell QDs. Luminescent quenching occurred with increasing temperature for the cores even though the cores exhibited high crystallinity. In contrast, with increasing temperature, the emission PL peak wavelength of the core/shell QDs shifts towards lower energies, the PL bandwidth increases a little and the PL efficiencies decrease slightly. The red-shifted degree of the PL spectra with temperature is small (less than 10 nm).
机译：通过在CdSe纳米棒上各向异性壳生长，在有机溶液中于高温下制备了具有高达85％的高光致发光（PL）效率的CdSe / Cd0.5Zn0.5S核/壳量子点（QDs）。通过控制核的大小和阵列Cd0.5Zn0.5S壳的厚度，可以获得PL峰值波长从绿色到红色的核/壳QD。核和核/壳量子点都显示出狭窄的尺寸分布，这导致了窄的PL光谱。具有富硒表面的绿色发射CdSe磁芯显示出约44 ns的长平均寿命。涂覆Cd0.5Zn0.5S壳后，量子点的平均寿命急剧下降，最高达到23 ns。核/壳量子点的平均衰减时间取决于壳的厚度。对于CdSe核和高发光CdSe / Cd0.5Zn0.5S核/壳量子点，研究了温度范围在293至393 K的PL。即使芯表现出高结晶度，但随着芯温度的升高，发生了发光猝灭。相反，随着温度的升高，核/壳QD的发射PL峰值波长移向较低的能量，PL带宽略有增加，PL效率略有下降。 PL光谱随温度的红移程度很小（小于10 nm）。

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