Tuning of emission color for blue dendrimer blend light-emitting diodes

Abstract

Published versio

Simple color tuning of phosphorescent dendrimer light emitting diodes

“…The emission from both dendrimers is phosphorescence. 5,8 Figure 2 These efficiencies are very much higher than our earlier work 12 on blending blue and blue-green fluorescent dendrimers ͑1.5 lm/ W͒. They are also much higher than the values reported by Kawamura et al 10 for phosphorescent small molecules blended with poly͑9-vinylcarbazole͒ as a host.…”

“…Recently, we have shown color tuning over a limited range from blue to blue-green by blending fluorescent dendrimers. 12 However, fluorescent dendrimers tend to be less efficient than phosphorescent dendrimers and in this letter we show that phosphorescent dendrimers can be blended to obtain color tuning in solution processed OLEDs with a simple ͑two organic layer͒ structure. We demonstrate color tuning from green to red by adjusting the relative amounts of red and green emitting dendrimers in a blend and show that high efficiencies are achieved across the color range.…”

The Versatile Thiophene: An Overview of Recent Research on Thiophene‐Based Materials

“…Improvements have, however, been reported in electroluminescent devices based on a variety of new thiophene derivatives. Efficient blue electroluminescence was obtained using blends of solution-processable thiophene-containing dendrimers, [67] while micrometer-wavelength electroluminescence was obtained from a copolymer of fluorene with an electron-donating thiophene ring bound to an electron withdrawing thiadiazolo-quinoxaline unit. [68] Copolymers of fluorene with incorporated thiophene or phenylene units gave pure red electroluminescence with maximum luminance 3100 Cd m ±2 and maximum external quantum efficiency of 0.46 % at low voltage (4 V).…”

Acridine Fluorescence Behaviors in Different Polymeric Microenvironments Directed by C2-Proton-Acidity of Imidazolium-Based Ionic Liquids

“…Photoluminescence, including fluorescence and phosphorescence as light emitted by electromagnetic radiation, is often used in a wide variety of purposes including fluorescent labeling, 1,2 semiconductor amplifiers, 3,4 solar cells, 5,6 and saturable absorbers. 7 N-Heterocyclic aromatic compounds such as acridine and its derivatives, which have a rigid planar structure and a high quantum yield of fluorescence, have recently generated a great deal of interest because of their use in the production of dyes and some valuable drugs, as well as in fluorescent labeling due to their ability to bind to DNA and RNA.…”