Author Affiliations
Abstract
1 School of Physics and Electronics, Hunan Normal University, Changsha 410081, China
2 International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
The optical Tamm state (OTS), which exists generally at the interface between metal and a dielectric Bragg mirror, has been studied extensively in the visible and near infrared spectra. Nevertheless, OTS in the terahertz (THz) region normally receives far less attention. In this Letter, we demonstrate the physical mechanism of OTS at the interface between graphene and a dielectric Bragg mirror in the THz frequency band by applying the transfer matrix method and dispersion characteristics. Based on such mechanisms, we propose an efficient method that can precisely generate and control OTS at a desired angle and frequency. Moreover, we show that the OTS is dependent on the optical conductivity of graphene, making the graphene–dielectric-Bragg-mirror a good candidate for dynamic tunable OTS device in the THz frequency range.
160.4236 Nanomaterials Chinese Optics Letters
2019, 17(2): 020008
1 吉林建筑大学, 吉林 长春 130118
2 中国科学院长春光学精密机械与物理研究所发光学及应用国家重点实验室, 吉林 长春 130033
使用典型绿色磷光材料Ir(ppy)3作为发光层，DBR 和金属Al作为微腔的一对反射镜，制备了结构为Glass/DBR/ITO/MoO3(1 nm)/TcTa(40 nm)/CBP:Ir(ppy)3(40 nm,6%)/TPBI(47 nm)/LiF(1 nm)/Al(80 nm)的绿色磷光微腔有机电致发光器件(MOLED)，同时制作了无腔对比OLED 器件，研究微腔结构对器件发光性能的影响。发现OLED 的电致发光谱(EL)的峰值是510 nm,半峰全宽(FWHM)为70 nm,MOLED 的峰值是514 nm,FWHM 为35 nm，比OLED 窄化了1/2，MOLED的最大亮度、最大电流效率分别为143000 cd/m2和64.4 cd/A，OLED 的最大亮度、最大电流效率分别为103000 cd/m2和41.6 cd/A；测试并计算了器件的外量子效率(EQE)，MOLED 和OLED 的最大EQE 分别为18.6%和14.3%。结果表明，微腔器件发光性能比无腔器件得到了很大的改善。
光电子学 发光二极管 微腔器件 有机材料
