Pyrene-based materials for organic electronics.

The light-emitting element of the present invention includes a light-emitting layer and a layer for controlling movement of carriers between a pair of electrodes. The layer for controlling movement of carriers includes a first organic compound having a carrier transporting property and a second organic compound for reducing the carrier transporting property of the first organic compound, and the second organic compound is dispersed in the first organic compound. The layer for controlling movement of carriers is provided in such a manner, whereby change in carrier balance with time can be suppressed. Therefore, a light-emitting element having a long lifetime can be obtained.

Light-emitting element, light-emitting device, and electronic device

A new series of blue-light-emitting fluorene derivatives have been synthesized and characterized. The fluorene derivatives have high fluorescence yields, good thermal stability, and high glass-transition temperatures in the range 145-193 °C. Organic light-emitting diodes (OLEDs) fabricated using the fluorene derivatives as the host emitter show high efficiency (up to 5.3 cdA - 1 and 3.0 lm W - 1 ) and bright blue-light emission (Commission Internationale de L'Eclairage (CIE) coordinates of x=0.16, y=0.22). The performance of the non-doped fluorene-based devices is among the best fluorescent blue-light-emitting OLEDs. The good performance of the present blue OLEDs is considered to derive from: 1) appropriate energy levels of the fluorene derivatives for good carrier injection; 2) good carrier-transporting properties; and 3) high fluorescence efficiency of the fluorene derivatives. These merits are discussed in terms of the molecular structures.

Highly Efficient Non-Doped Blue Organic Light-Emitting Diodes Based on Fluorene Derivatives with High Thermal Stability

Steric Inhibition of π-Stacking: 1,3,6,8-Tetraarylpyrenes as Efficient Blue Emitters in Organic Light Emitting Diodes (OLEDs)

A highly efficient blue-light emitter, 2-tert-butyl-9,10-bis[4'-(diphenyl-phosphoryl)phenyl]anthracene (POAn) is synthesized, and comprises electron-deficient triphenylphosphine oxide side groups appended to the 9- and 10-positions of a 2-tert-butylanthracene core. This sophisticated anthracene compound possesses a non-coplanar configuration that results in a decreased tendency to crystallize and weaker intermolecular interactions in the solid state, leading to its pronounced morphological stability and high quantum efficiency. In addition to serving as an electron-transporting blue-light-emitting material, POAn also facilitates electron injection from the Al cathode to itself. Consequently, simple double-layer devices incorporating POAn as the emitting, electron-transporting, and -injecting material produce bright deep-blue lights having Commission Internationale de L'Eclairage coordinates of (0.15,0.07). The peak electroluminescence performance was 4.3% (2.9 cd A -1 ). For a device lacking an electron-transport layer or alkali fluoride, this device displays the best performance of any such the deep-blue Organic light-emitting diodes reported to date.

https://ir.nctu.edu.tw:443/bitstream/11536/16689/1/000264275300005.pdf

Multifunctional Deep-Blue Emitter Comprising an Anthracene Core and Terminal Triphenylphosphine Oxide Groups

Anthracene derivative for a non-doped blue-emitting organic electroluminescence device with both excellent color purity and high efficiency

https://www.rsc.org/suppdata/cc/b5/b506459g/b506459g.pdf

Weigang Ju

Papers

Anthracene derivative for a non-doped blue-emitting organic electroluminescence device with both excellent color purity and high efficiency

A facile route to fabrication of inorganic-small organic molecule cable-like nanocomposite arrays.

Solvatochromic effect of a fluorescence probe used to study the environmental properties of organic montmorillonite