Multi-solution processes of small molecule for flexible white organic light-emitting diodes

作者：Tsai Yu Sheng^*; Chittawanij Apisit; Hong Lin Ann; Guo Siou Wei; Wang Ching Chiun; Juang Fuh Shyang; Lai Shih Hsiang; Lin Yang Ching

来源：Thin Solid Films, 2016, 604: 94-101.

DOI：10.1016/j.tsf.2016.02.015

• Organic light-emitting diodes
• Solution process
• Stamping transfer
• Small molecule
• Multilayer

Most small molecule organic light emitting diode (SM-OLED) device structures are made in one layer using solution-based processing because the solution is usually a high dissolvent material that easily attacks the layer below it. We demonstrate a simple and reliable stamping technique for fabricating multi-solution process flexible white SM-OLEDs. The structure is anode/spin-hole injection layer/spin-emitting layer/stamping-electron transport layer/cathode. Poly(di-methyl silane) (PDMS) stamp is used for transferring electron transport layer. An intermediate ultraviolet-ozone surface treatment is introduced to temporarily modify the PDMS stamp surface. Then, the solution-based electron transport layer film can therefore be uniformly formed on top of the PDMS surface. After that the electron transport layer film on the PDMS stamp is transfer-printed onto the emitting layer with suitable heating and pressing. A solution-based processing is successfully established to efficiently fabricate flexible white SM-OLEDs. The SM-OLEDs were obtained at the current density of 20 mA/cm(2), luminance of 1062 cd/m(2), current efficiency of 5.57 cd/A, and Commission internationale de l'eclairage coordinate of (0.32, 0.35).

• 出版日期2016-4-1