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首页> 外文期刊>Applied Surface Science >Synthesis Of Cds Nanocrystals By A Microwave Activated Method And Investigation Of The Photoluminescence And Electroluminescence Properties
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Synthesis Of Cds Nanocrystals By A Microwave Activated Method And Investigation Of The Photoluminescence And Electroluminescence Properties

机译：微波活化法制备Cds纳米晶及其光致发光和电致发光性能的研究

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摘要

We have synthesized CdS nanocrystals (NCs) by a microwave activated method. CdSO_4 and were used as the precursors and thioglycolic acid (TGA) was used as capping agent molecule. The aqueous synthesis was based on the heat sensitivity of Na_2S_O_3. In this method, microwave irradiation creates the activation energy for dissociation of Na_2S_O_3 and leads to the CdS NCs formation. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses demonstrated hexagonal phase CdS NCs with an average size around 3 nm for sample prepared at 5 min irradiation time. A band gap range of 3.38-2.89 eV was possible only by increasing the microwave irradiation time, corresponding to a 2.7-3.7 nm size. Photoluminescence (PL) spectra showed a white emission between 400 and 750 nm. The best attained PL quantum yield (QY) of the NCs was about 10%. Synthesized NCs were used as emissive layer in a light emitting device (LED) with lTO/PEDOT:PSS/PVK/CdS-NCs/AL structure. Turn on voltage of fabricated device was about 7 V. The CIE color coordinate of the LED at (0.34,0.43) demonstrated a near white light LED with an emission on green-yellow boundary of white.
机译：我们已经通过微波激活方法合成了CdS纳米晶体（NCs）。使用CdSO_4和CdSO_4作为前体，使用巯基乙酸（TGA）作为封端剂分子。水合成是基于Na_2S_O_3的热敏感性。在这种方法中，微波辐射会产生用于Na_2S_O_3分解的活化能，并导致CdS NCs的形成。 X射线衍射（XRD）和透射电子显微镜（TEM）分析表明，在5分钟的照射时间下制备的样品的六方相CdS NCs平均尺寸约为3 nm。仅通过增加微波辐照时间（对应于2.7-3.7 nm的尺寸），带隙范围才可能达到3.38-2.89 eV。光致发光（PL）光谱显示400至750 nm之间的白色发射。 NC的最佳PL量子产率（QY）约为10％。合成的NC用作具有ITO / PEDOT：PSS / PVK / CdS-NCs / AL结构的发光器件（LED）中的发射层。制成的器件的开启电压约为7V。LED的CIE颜色坐标为（0.34,0.43），显示出近白色的LED，在白色的绿色-黄色边界上发射。

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