6‐3: Distinguished Paper: Highly Efficient Fluorescent Blue Materials and Their Applications for Top Emission OLEDs

Abstract

We developed new fluorescent blue dopants (BDs) for achieving high efficient blue organic light emitting diode (OLED). The new BD showed both high photoluminescent quantum yield >0.9 and highly horizontal orientation (S'>0.9) in the doped film with keeping a chemical stability by introducing suitable substituents. We developed hole transporting materials and optimized the combination of hole transporting layers to decrease a carrier accumulation at the interface between electron blocking layer/emission layer (EML). We found that the external quantum efficiency dependency from low to high current density was turned flat by promoting hole injection into EML. The Top Emission OLED using the new BD and the optimized device architecture exhibited high efficiency of L/J/CIEy around 200 at CIEy=0.043.

Development of Long Lifetime and High Performance Organic Light Emitting Diode Display with Wide Temperature Range

“…The lifetimes of the OLEDs were measured under 50 mA/cm 2 for the B-and R-OLEDs, and 30 mA/cm 2 Current-voltage characteristics (J-V curves) and chromaticity were measured on a DOEL-001-1 developed by Daitron Technology Co. The measurements were carried out at 25 °C with using the HTDs.…”

“…Organic light emitting diode (OLED) displays show great display performances such as high contrast ratio, wide color gamut, wide viewing angle, and etc. [1][2][3][4].…”

48‐2: Design Strategies of Fluorescent Dopants toward Pure Blue for Highly Efficient Top Emission OLEDs

“…It is known that light outcoupling efficiency is strongly related to orientation and spectral shape. In SID 2018, we reported BD-1 with PLQY>0.9 and orientation factor S'>0.9, leading to the spectral shape as next leverage for improved device results [5].…”