柔性交流电致发光器件的光电性能优化与自供电集成研究

Optimization of Flexible Alternating⁃current Electrolumines⁃cence Devices and its Integration with Self⁃powered Friction Nanogenerator

以掺铜硫化锌(ZnS:Cu)荧光粉为发光分子,聚二甲基硅氧烷(PDMS)和钛酸钡(Ba‑TiO3)为绝缘材料,采用刮涂技术在ITO/PET电极上制备了柔性ACEL器件,研究了复合发光层不同材料掺比、驱动电压和频率对器件光电性能的影响。结果表明,随着荧光粉和钛酸钡含量的增加,柔性ACEL器件的亮度增加;当ZnS:Cu/BaTiO_(3)/PDMS=2∶2∶1时,器件性能最佳,可以达到较低的开启电压,40 V(2 kHz)时亮度为1.16 cd/m^(2)。最后,将柔性ACEL与垂直接触分离式摩擦纳米发电机进行集成,TENG最大输出电压可达360 V和输出电流46μA左右,可以点亮柔性ACEL器件。该自供电柔性ACEL器件为穿戴显示和交互提供了一种新的方法。

The flexible ACEL device was fabricated on ITO/PET electrode using copper-doped zinc sulfide(ZnS:Cu)phosphor as luminescent molecule,polydimethylsiloxane(PDMS)and barium titanate(BaTiO3)as insulating material by scraping technology.The effects of different material mixing ratio,driving voltage and frequency of composite luminescent layer on the photoelectric properties of the device were studied.The results showed that the luminance of flexible ACEL devices increased with the increase of phosphor and barium titanate content.When ZnS:Cu/BaTiO_(3)/PDMS=2∶2∶1,the device performance was the best,and the lower opening voltage could be achieved.The luminance could reach 1.16 cd/m^(2)at 40 V and 2 kHz.Finally,the flexible ACEL device was integrated with the vertical contact separation friction nanogenerator.The maximum output voltage and current of the TENG could reach 360 V and 46μA,which could light up the flexible ACEL devices.The self-powered flexible ACEL devices could provide a new method for wearable display and interaction.