P-207: Novel Buffer Materials with High Work Function for Efficient and Stable Organic Light-Emitting Diodes

We introduce novel water based buffer materials with high work function (5.5 − 5.6 eV), thermal stability, and low acidity (> pH 3). These materials are even stable at both neutral and basic conditions (> pH 7). When PLED devices are fabricated, even though there are high energy barrier between ITO (ca. 4.8 eV) and the buffer material and each buffer layers compared with that between ITO and Baytron‐P, J‐V characteristics of the device with our buffer layers are more improved than those with Baytron‐P series (AI 4083 and CH 8000). Also their performance showed higher luminous efficiency (170% @ 1000 nit) and better device lifetime (>1.7 times) using new buffer materials compared with those of Baytron‐P series even though we have yet to optimize the device structures.