Persistent time-delayed luminescence was observed in bulk polymer Polyamide-6 (nylon 6) samples at room temperature. Using X-ray 2Θ-diagnostics we have separated two crystalline forms of the material which exhibit serious differences in their time-delayed luminescence properties. Whilst for the α-form the afterglow temperature threshold is at the range of 100 °C, the γ-form samples require cooling to about −20 °C for the effect becomes observed by eye. The afterglow relaxation traces are highly reproducible and we extracted the Becquerel law function (compressed hyperbola) for them. The conclusion derived on the origin of the effect is the photoinduced charge recombination process. A theoretical model is presented for the explanation of the experimental results.

在室温下，在本体聚合物聚酰胺6（尼龙6）样品中观察到持久的延时发光。使用X射线2θ诊断，我们分离了材料的两种晶体形式，它们在延时发光特性方面表现出严重差异。对于α形式，余辉温度阈值在100°C的范围内，而γ形式的样品需要冷却至约-20°C，才能通过肉眼观察到效果。余辉松弛痕迹可高度重现，我们为其提取了贝克勒尔定律函数（压缩双曲线）。从效应的起源得出的结论是光诱导的电荷复合过程。提出了理论模型来解释实验结果。