title: [Proof of solid state cathodoluminescence by using brightness waveform].
abstract: Three different inorganic-organic hetero-junctions (A: ITO/SiO2/Alq3/Al, B: ITO/Alq3/SiO2/Al and C: ITO/SiO2/Alq3/SiO2/Al) were fabricated. The emission can be observed only under positive bias in devices A and B, but under both biases in device C according to their brightness waveforms. With increasing voltage, the increase in blue emission in devices B and C is faster than that in green emission. This is because that the recombination of hot electrons and holes, i.e., electron-hole pairs, produced blue emission in devices B and C, and the recombination of electrons injected from Al with the accumulated holes, which are excited by hot electrons, produced green emission in device A. Hence, the emissions of the devices are attributed to not only the recombination of electrons and accumulated holes, but also the cathodoluminescence-like (CL-like) emission.
authors.affiliation: Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Liu
authors.forename: Xiao-hong
authors.initials: XH
authors.lastname: Chen
authors.forename: Zheng
authors.initials: Z
authors.lastname: Xu
authors.forename: Feng
authors.initials: F
authors.lastname: Teng
authors.forename: Li-xin
authors.initials: LX
authors.lastname: Yi
authors.forename: De-wen
authors.initials: DW
authors.lastname: Gao
authors.forename: Li-qun
authors.initials: LQ
authors.lastname: Guo