Preparation Of Flexible Electroluminescent Device In 100 Mm×100 Mm Class And Investigation Of Optoelectronic Properties

Organic Light-Emitting Device（OLED）has become ubiquitous in everyday life,boasting exceptional characteristics such as high color contrast,a wide color gamut,low blue-light damage,and a thin and lightweight design.In the commercial sphere,OLED is trending towards larger,thinner,and more flexible displays in order to create more innovative and unique products.With this in mind,this manuscript delves into an OLED preparation method based on composite transparent electrodes.The composite transparent electrode is composed of metal oxides and ultrathin metals,and its structural properties are analyzed to achieve a high-quality and smooth transparent electrode surface,successfully balancing ideal optical transmittance and lateral conductivity values.For the production of flexible large-area OLED,a range of issues must be addressed,including uneven light emission over a large surface area,low efficiency,easy device short-circuiting,and poor flexibility.In this study,large-area OLED devices of the 100 mm×100 mm class were produced with uniform light emission by refining the production process,including improving the ITO cleaning process,pretreating the ITO substrate,and enhancing the driving circuit.These advancements are of great significance in addressing the current challenges faced by flexible large-area OLEDs.The primary research of this thesis is outlined as follows:The Atomic Layer Disposition（ALD）and vapor deposition techniques were utilized to fabricate transparent electrodes with a Zn O/Ca:Au/Al₂O₃（ZCAA）structure.The semiconductor-metal contact’s Schottky barrier reduction effect was investigated to confirm the advantageous effect of the Zn O layer in the composite transparent electrode.Experimental tests and theoretical calculations were utilized to determine the maximum thickness of the Zn O layer,allowing for sufficient space during the composite transparent electrode preparation.The Ca:Au alloy was suggested as an intermediate metal layer of the composite transparent electrode due to its innovative doping effect.The doping effect of metals enhances the deposition of Ca and the efficient electron transfer capability of Au renders it a suitable application to OLED cathodes.The prepared ZCAA electrode was employed in a transparent flexible OLED with the PEN/ITO/HAT-CN/TAPC/CBP:Ir（ppy）₂（acac）/TPBi/Li F/ZCAA structure,and the test results validated the high conductivity and bending performance of the ZCAA composite transparent electrode.The luminescence of both sides of this OLED device peaks and the J-V-L curves on both sides of this OLED device are consistent,making it ideal for transparent OLED.To tackle the uneven luminescence and short-circuit points in the production of large-area OLED,the preparation process was simply optimized.Moreover,the cathode mask plate’s design optimizes the driving circuit of large-area OLED.The device structure is Glass/ITO/Mo O₃/NPB/Alq₃/Al,and the maximum luminance was 21861 cd/m².In a word,this work provides a novel composite transparent electrode material and effectively employs it in OLED.Additionally,an optimization approach for the large-scale production process of OLED is proposed,resulting in the successful creation of a large-area OLED with exceptional luminescence performance.These innovative concepts and techniques offer valuable practical applications for advancing OLED technology.