Efficient Solution-Processed Blue Electrophosphorescent Devices Based on a Novel Small-Molecule Host

Efficient blue small molecular phosphorescent fight-emitting diodes with a blue phosphorescent dye bis（3,5- difluoro-2-（2-pyridyl）-phenyl-（2-carboxypride） iridium （Ⅲ） （Flrpic） doped into a novel small-molecule host 9,9- bis[4-（3,6-di-tert-butylcarbazol-9-yl）phenyl] fluorene （TBCPF） as the light-emitting layer have been fabricated by spin-coating. The host TBCPF can form homogeneous amorphous films by spin-coating and has triplet energy higher than that of the blue phosphorescent dye Flrpic. All the devices with different Flrpic concentration in the emitting layer give emission from Flrpic indicating complete energy transfer from TBCPF to Flrpic. The device shows the best performance with a peak brightness of 8050 cd/m^2 at 10.2 V and the maximum current efficiency up to 3.52 cd/A, when the Flrpic doped concentration is as high as 16%.     

磁质谱的发展及应用进展

对磁质谱的发展及应用进展进行了综述。介绍了磁质谱仪的发展历史,分别对热电离质谱仪、电感耦合等离子体质谱仪、激光共振电离质谱仪、辉光放电质谱仪、加速器质谱仪、二次离子质谱仪的发展、基本结构、工作原理、优缺点进行了探讨,并对不同磁质谱仪的主要测量对象和应用学科进行了分析和总结。对磁质谱仪的发展方向进行了展望,提出了国内研制磁质谱的迫切需求。