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国家自然科学基金(91123019)

作品数:3 被引量:4H指数:1
相关作者:宋孝辉邓建平汪敏强更多>>
相关机构:西安交通大学更多>>
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ZnO纳米晶薄膜的制备及特性分析
2013年
在低温下制备了粒径小于10nm的ZnO纳米晶,用旋涂法制备ZnO纳米晶薄膜,XRD分析ZnO晶相是纤锌矿结构;SEM与AFM表明,纳米晶薄膜在300%退火后薄膜的厚度明显减小到130nm,表面粗糙度降低到3.27nm,粒径明显增大;紫外-可见吸收和透射比光谱表明,随着退火温度的增加,吸收边发生了红移,吸收肩更明显,薄膜具有高的透射率(75—85%);薄膜方阻随温度增加而增大,300℃以下退火方阻增加很小(小于8.5Ω/sq),400℃以上退火方阻大幅增加(大于21.1Ω/sq),因此,ZnO纳米晶薄膜最优退火温度点为300℃。
邓建平汪敏强宋孝辉
关键词:ZNO纳米晶ZNO薄膜水热法旋涂法
Combustion synthesis and luminescence properties of Ca4Y6(SiO4)60:Eu3+ red phosphor for white LEDs被引量:3
2013年
Eu3+ activated Ca4Yt(SiO4)60 phosphors were prepared by combustion synthesis method, and their morphologies and lu- minescent properties were investigated. Field scanning electron microscopy (FSEM) confirmed that the crystallite sizes of nanoparti- cles with narrow diameter ranging from 30 to 60 rim. The excitation spectra of CaaY6(SiO4)60:Etl3+ showed that there existed two strong excitation bands at around 399 nm (TFo----~SL6) and 469 nm (TF0---*SD2), which were consistent with the output wavelengths of near-UV and blue LEDs, respectively. The emission spectra of Ca4Y6(SiO4)60:Eu3+ were dominant by a red peak located at 614 nm due to the 5Do→7TF2 transition of Eu3+. With the increase of Eu3+concentration, the luminescence intensity of the red phosphor reached maximum and then decreased. The optimum concentration for Eug+in Ca4Y6(SiO4)60 was 21 mol.%.
ZnO/Ag nanowires composite film ultraviolet photoconductive detector被引量:1
2015年
ZnO/Ag nanowires (NWs) film ultraviolet (UV) detector was fabricated by a simple and low-cost solution-processed method. In order to prepare this device, Ag NWs network was first spin-coated on glass sub- strate as a transparent conducting electrode, then ZnO NWs arrays were grown vertically on the Ag NWs network based on the hydrothermal method. This UV detector exhibited an excellent detection performance with large on/off ratio and short response time. Several process and working parameters were particularly investigated to analyze the relationship between structure and performance, which include growth time of ZnO NWs array, spin speed of Ag NWs network and working temperature. This UV photoconductive detector is based on two kinds of one-dimension nanomaterials, and it was regarded as a compromise between high performance with large area, low voltage and low cost.
闫国栋汪敏强杨智
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