物理气相沉积法制备TP/TFA纳米薄膜与光致发光特性探究

为了探究有机荧光材料在微纳尺寸上的荧光特性，采用低真空物理气相沉积方法制备了茶碱（TP）和2，3，5，6-四氟对苯二甲酸（TFA）有机纳米薄膜。通过对TP和TFA薄膜的荧光性质进行表征发现：与TP粉末相比薄膜的荧光发射峰由1个增加到4个，发射波长范围拓宽了100 nm，TFA的荧光发射峰之间的相对荧光强度发生了变化，与原料粉末相比在408 nm处的荧光发射峰蓝移了7 nm，362 nm处的荧光发射峰红移了3 nm。另外随着纳米薄膜厚度的逐渐增加，其荧光效率也逐渐增大。通过对TP和TFA纳米薄膜的表面形貌表征发现：随着薄膜厚度的增加，颗粒的聚集形态尺寸逐渐增大，从而验证了荧光效率随膜厚增加而逐渐提升的特性。

Preparation of theophylline/2,3,5,6-tetrafluoroterephthalic acid (TP/TFA) nano films by physical vapor deposition and their photoluminescence properties

In order to investigate the fluorescence characteristics of organic fluorescent materials on the micro-nano scale, organic nanofilms have been prepared by low-vacuum physical vapor deposition. After preparing the organic nanofilms, it was found that compared with powdered theophylline (TP) the intensity of the fluorescence peak of TP at 408 nm increased by a factor of four, the emission wavelength range was broadened by 100 nm, and the relative intensities of the fluorescence peaks of TP and 2,3,5,6-tetrafluoroterphthalic acid (TFA) changed. The peak blue shift was 7 nm, and the fluorescence peak at 362 nm was red-shifted by 3 nm. In addition, as the thickness of the nanofilm increased, its fluorescence efficiency also increased. It was also found that as the thickness of the film increased, the aggregate size of the particles gradually increased, and this is responsible for the observed increase in fluorescence efficiency.