In this study. HATCN is coated on flexible PET/indium tin oxide (ITO) substrate as a modified layer and a hole injection layer to improve the hole injection from ITO. Then a blue organic light emitting diode (OLED) can successfully be fabricated without a surface treatment procedure (O2 plasma or UV Ozone treatment). The new blue TADF series fluorescent material is employed as ... https://www.bekindtopets.com/flash-pick-Ovation-Toddler-Metallic-Schooler-Helmet-XXSmall-XSmall-hot-choice/