Adjustable electroluminescence: blue-green to red organic light-emitting diodes based on novel poly-non-conjugated oligomers

Synthesis of Light-Emitting Conjugated Polymers for Applications in Electroluminescent Devices

“…The emission at 580 nm may come from an exciplex. 2237 For a blend of 1167 with PVK, the emission color changes from blue (λ max ) 420 nm) at 5 V to orange (λ max ) 520 nm) at 9 V, but with a drop in efficiency. 2238 Blending the PPP derivative 542 with the ultraviolet (λ max ) 354 nm) emitting polysilane 1168a leads to a 50-fold increase in the EL efficiency and the suppression of an aggregate emission band around 530 nm, so as to give pure blue emission (λ max ) 430-440 nm).…”

“…The emission color changes from blue-green to white and then to red with increasing PVK content. The emission at 580 nm may come from an exciplex . For a blend of 1167 with PVK, the emission color changes from blue (λ max = 420 nm) at 5 V to orange (λ max = 520 nm) at 9 V, but with a drop in efficiency…”

High-Brightness and Low-Voltage Light-Emitting Devices Based on Trischelated Ruthenium(II) and Tris(2,2‘-bipyridine)osmium(II) Emitter Layers and Low Melting Point Alloy Cathode Contacts

“…Organic solid-state light-emitting devices (OLEDs) may eventually offer an alternative to inorganic semiconductor (e.g., GaAs) light-emitting diodes and liquid crystal displays, perhaps affording flatter, brighter, and more flexible displays at lower cost. − There has been a great deal of research aimed at the development of new light-emitting materials. − Among the materials that have been studied, polymers based on trischelated ruthenium(II) complexes have recently attracted considerable attention. − Attempts have been made to increase the duration of operation and to improve the performance of light-emitting materials with dopant in the emitters, − dopant in the hole-transport materials, − electron-transport materials, , transparent electrodes, and surface treatment of indium−tin oxide (ITO). , Furthermore, with the realization that the overall improvement of the performance and durability of LEDs is related to the improvement of the metal contact, much research has been focused on understanding the nature of charge injection from contacts, − …”