Double emitting layer (yellow and blue) phosphorescent organic light emitting devices (OLEDs) were fabricated using different materials as the interlayer. The structure of the devices is ITO/NPB/(t-bt)2Ir(acac)/interlayer/BCP: FIr6/Bphen/Mg:Ag. Interlayers are mCP, TPBi, and TAPC, respectively. Comparing three kinds of interlayer, the luminescence characteristics of the devices are investigated. The results show that the current efficiency and the brightness are greatly improved because of the application of interlayer. Using the mCP as the interlayer, we obtained the maximum current efficiency of 39 cd/A and the maximum brightness of 18360 cd/m2, the color stability is also be enhanced.
A high performance organic integrated device (OID) has been realized with a thermally activated delayed fluorescence (TADF) material namely, 4,5-bis(carbazol-9-yl)-1,2-dicyanobenzene (2CzPN) and another transport material named 4,7-diphenyl-1, 10-Phenanthroline (Bphen) with an interbedded architecture as the active layer. The OID had a high detectivity of 0.8×1012 Jones at -1 V under the UV-365 nm illumination with an intensity of 0.2 mW/cm2, and yielded an exciplex EL light emission with a maximum luminance of ~12000 cd/m2. While the non-intebedded device has a detectivity of 4.1×1010 Jones and a maximum luminance of 8300 cd/m2.
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