Ortiz-Morales A, Ortiz-Lopez J, Cruz-Zaragoza E, Gómez-Aguilar R
Unidad Profesional Interdisciplinaria de Ingeniería y Tecnologías Avanzadas, IPN, Av. Instituto Politécnico Nacional 2580, Col. La Laguna Ticoman, 07340 México D.F., México; Unidad de Irradiación y Seguridad Radiológica, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, A.P. 70-543, 04510 México D.F., México.
Escuela Superior de Física y Matemáticas, IPN, Av. Instituto Politécnico Nacional s/n, Col. San Pedro Zacatenco, 07738 México D.F., México.
Appl Radiat Isot. 2015 Aug;102:55-62. doi: 10.1016/j.apradiso.2015.04.013. Epub 2015 May 6.
Effects of irradiation with (60)Co gamma photons on poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), poly[2-methoxy-5-(3',7' dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) and tris(2,2'-bipyridyl)dichlororuthenium(II) hexahydrate (Ru(bpy)3) thin films were analyzed regarding their thermoluminescence (TL) and photoluminescence (PL) properties. A linear TL dose response was obtained from the MEH-PPV and MDMO-PPV polymer films in dose ranges of approximately 0.170-4.08kGy and 0.170-0.850kGy, respectively, followed by a supralinear behavior. A dependence on the conjugation length of the polymer chains which was favored by heating of the film, was observed, and irradiation generated a blue-shift in MEH-PPV and Ru(bpy)3. Furthermore, the PL structure was not modified. The most likely effect involved in the TL emission was trapping. The high activation energy values of the traps in the TL may be attributed in part to the binding energy of the exciton. A deconvolution process was carried out to obtain the kinetic parameters from the TL glow curves and PL spectra.
分析了用钴 - 60γ光子辐照聚[2 - 甲氧基 - 5 - (2 - 乙基己氧基)-1,4 - 亚苯基亚乙烯基](MEH - PPV)、聚[2 - 甲氧基 - 5 - (3',7' - 二甲基辛氧基)-1,4 - 亚苯基亚乙烯基](MDMO - PPV)和三水合二氯三(2,2'-联吡啶)钌(II)(Ru(bpy)₃)薄膜对其热释光(TL)和光致发光(PL)特性的影响。在剂量范围分别约为0.170 - 4.08kGy和0.170 - 0.850kGy内，从MEH - PPV和MDMO - PPV聚合物薄膜获得了线性TL剂量响应，随后是超线性行为。观察到对通过薄膜加热而有利于的聚合物链共轭长度的依赖性，并且辐照在MEH - PPV和Ru(bpy)₃中产生了蓝移。此外，PL结构未被改变。TL发射中最可能涉及的效应是俘获。TL中陷阱的高活化能值可能部分归因于激子的结合能。进行了去卷积过程以从TL发光曲线和PL光谱获得动力学参数。
