Saengsonachai Alisa, Seekaew Yotsarayuth, Traiwatcharanon Pranlekha, Wongchoosuk Chatchawal
Department of Physics, Faculty of Science, Kasetsart University, Chatuchak, Bangkok 10900, Thailand.
Department of Physics, Faculty of Science, Ramkhamhaeng University, Bang Kapi, Bangkok 10240, Thailand.
Nanotechnology. 2022 Jul 14;33(40). doi: 10.1088/1361-6528/ac7cf5.
Alternating current electroluminescent (AC-EL) device can be considered as a potential candidate for next generation of multifunctional light-emitting sources. In this work, we present a new design of AC-EL device with inclusion of a silver oxide humidity-sensing layer instead of an insulating buffer layer for humidity detection. The ZnS:Cu, Cl and ZnS:Ag(Zn,Cd)S:Ag phosphors were used as an emissive layer prepared by screen printing method. The silver oxide (AgO/AgO) nanoparticles synthesized via a green method were employed as a humidity sensing layer. The developed AC-EL devices exhibited high response, good productivity, high stability, high repeatability and linear relationship with humidity in range of 10%-90% RH as well as no significant effects with several VOCs/gases such as NH, CO, acetone, methanol, toluene and propan at room temperature. The effects of parameters such as excitation frequency, applied voltage, and waveforms on the luminance intensity are discussed. The development of the present AC-EL device offers a simplified architecture to enable sensing functions of the AC-EL device via monitoring of light emission changing.
交流场致发光（AC-EL）器件可被视为下一代多功能发光源的潜在候选者。在这项工作中，我们提出了一种新型AC-EL器件设计，其中包含氧化银湿度传感层而非用于湿度检测的绝缘缓冲层。ZnS:Cu,Cl和ZnS:Ag(Zn,Cd)S:Ag荧光粉用作通过丝网印刷法制备的发光层。通过绿色方法合成的氧化银（AgO/AgO）纳米颗粒用作湿度传感层。所开发的AC-EL器件在10%-90%RH范围内表现出高响应、良好的生产率、高稳定性、高重复性以及与湿度的线性关系，并且在室温下对NH、CO、丙酮、甲醇、甲苯和丙烷等几种挥发性有机化合物/气体没有显著影响。讨论了诸如激发频率、施加电压和波形等参数对发光强度的影响。当前AC-EL器件的开发提供了一种简化架构，可通过监测发光变化实现AC-EL器件的传感功能。
