Multilayer organic electroluminescent devices (OELDs) were fabricated with highly pure 2-(2-hydroxyphenyl)benzoxazolato lithium (LiPBO), which was obtained through stepwise purification process, as a blue emission layer. The ionization potential of the carefully purified LiPBO was ∼5.82 eV. The multilayer OELD with a hole-blocking layer (HBL) emitted almost pure blue light with the CIE color coordinate of x=0.15 and y=0.08. However, the emission color was redshifted when an electron-transporting layer (ETL) was introduced instead of the HBL. The device with both the HBL and the ETL showed stable and bright blue emission above 14 000 cd/m2 with the color coordinate of x=0.15 and y=0.11, even though the color purity was slightly poorer than that with only the HBL.
We have fabricated 3.2″ QVGA transparent AMOLED by integrating photostable top gate IGZO TFT array and highly transparent OLED. The photostability of oxide TFT was investigated under constant gate bias and constant current CC stress to explore the possibility of OLED application. After 40 hours CC stress of 10 μA with halogen lamp illumination, the ΔVth was just − 0.22 V while that obtained under dark was + 0.1 V. with newly designed OLED cathode and transparent getter we increase OLED transmittance up to 80% with keeping resistance of cathode at 6 Ω;/□. Outdoor stability of OLED and oxide TFT make transparent AMOLED viable in the real market.
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