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arXiv 0903.3735cond-mat.mtrl-sci
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ZnO纳米结构可见光致发光的场致可逆控制

Field induced reversible control of visible luminescence in ZnO nanostructures

Manoranjan Ghosh, A. K. Raychaudhuri

摘要:

在本工作中,通过对夹在ITO和LiClO 4/PEO固体电解质之间的纳米结构ZnO薄膜施加几伏(<5V)电压,实现了对荧光粉ZnO可见光发光的可逆控制。由于ZnO是一种良好的吸收材料,但ITO-Glass衬底在320-375 nm范围内是透明的,因此ZnO-ITO界面被穿过ITO玻璃衬底的345 nm光照射,并且在反射模式下收集了545 nm附近的发射光。当固体聚合物电解质是负偏置的,高达107%的可见光的发光增强已被观察到,而一个完整的淬火(87%的减少)的可见光发射已被视为当它是正偏置。然而,在紫外区的尖锐的近带边(NBE)发射在我们工作的电压范围内没有依赖性。发光输出跟随所施加电压的变化,直到由装置的响应时间限制的最大频率,该响应时间在20-30秒的范围内。通过向导电聚合物施加负偏压而产生的向上能带弯曲填充费米能级以上的缺陷能级的数量增加,这增强了可见光致发光,反之亦然。

英文摘要:

In this work, a reversible control over the visible luminescence of phosphor ZnO is achieved by the application of a few volts (<5V) to nanostructured ZnO film sandwiched between ITO and LiClO4/PEO solid electrolyte. Since ZnO is a good absorbing material but ITO-Glass substrate is transparent in the range of 320-375 nm, the ZnO-ITO interface has been illuminated by a 345 nm light passing through the ITO glass substrate and the emitted light near 545 nm has been collected in reflection mode. When the solid polymer electrolyte is negatively biased, up to 107 percent enhancement in the visible luminescence has been observed, whereas a complete quenching (87 percent reduction) of the visible emission has been seen when it is positively biased. The sharp near band edge (NBE) emission in the ultraviolet region however has no dependence within the voltage range we are working. The luminescence output follows variations in the applied voltage up to maximum frequency limited by response time of the device which lies within the range of 20-30 sec. The upward band bending created by application of negative bias to the conductive polymer populates increasing number of defect levels above the Fermi level which enhances the visible photoluminescence and vice versa.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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