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By employing cesium carbonate doped tris-(8-hydroxyquinoline) aluminum/MoO3 as the effective charge generation layer(CGL),high efficiency two-unit series connected tandem organic light-emitting diodes were fabricated.It is found the performance of the two-unit tandem devices can be controlled by the thickness of the MoO3 layer.The 30 nm-thick MoO3 CGL tandem device exhibits the best device performance with the current efficiency of 14.5 cd/A,which is above 2.0 times than that of the control device over a wide range of current densities.It's suggested that the connecting layer broke down under a high current density,leading to the decrease of current efficiency.The improvement of tandem device performance is attributed to the efficient electron and hole injection from charge generation layer to two adjacent emission units.

In order to make full use of output characteristics of high energy, ultrashort pulse width of sub-picosecond ultraviolet lasers, a calibration platform of laser inertial confinement fusion(ICF) diagnostic equipment is established. The calibration platform has such functions as laser energy measurement, optical transmission delay, beam splitting and geometric decline, and sequential optical pulse generator, which can provide the structural support and high vacuum operating environment for the relevant diagnostic equipment. The mechanical and optical design is developed in all parts of the platform, and the platform is used to calibrate the X-ray diode response time, X-ray streak camera sweep speed, X-ray framing camera dynamic range and so on. The results show that the calibration platform matches the sub-picosecond ultraviolet calibration source well, and can achieve precise calibration of various diagnostic equipments. © 2017, Chinese Lasers Press. All right reserved.