High brightness deep blue/violet fluorescent polymer light-emitting diodes (PLEDs)

High-efficiency organic light-emitting diodes with fluorescent emitters.

Fluorescence-based organic light-emitting diodes have continued to attract interest because of their long operational lifetimes, high colour purity of electroluminescence and potential to be manufactured at low cost in next-generation full-colour display and lighting applications. In fluorescent molecules, however, the exciton production efficiency is limited to 25% due to the deactivation of t...

Contact Injection into Polymer Light-Emitting Diodes

The variation of current I with voltage V for poly(phenylene vinylene) and other polymer light-emitting diodes has been attributed to carriers tunneling into broad conduction and valence bands. In actuality the electrons and holes tunnel into polaron levels and transport is by hopping among these levels. We show that for small injection the I-V characteristic is determined mainly by the image f...

High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System

High-brightness organic light-emitting diodes for optogenetic control of Drosophila locomotor behaviour

Organic light emitting diodes (OLEDs) are in widespread use in today's mobile phones and are likely to drive the next generation of large area displays and solid-state lighting. Here we show steps towards their utility as a platform technology for biophotonics, by demonstrating devices capable of optically controlling behaviour in live animals. Using devices with a pin OLED architecture, suffic...

High-brightness II–VI light-emitting diodes grown by molecular-beam epitaxy on ZnSe substrates

High-brightness blue and green light-emitting diodes ~LEDs! based on II–VI double heterostructures ~DHs! have been successfully grown by molecular-beam epitaxy ~MBE! on ~100! ZnSe substrates. These LED structures consist of a 500–1000 Å thick active region of undoped blue-emitting Zn0.9Cd0.1Se/ZnSe multiple quantum wells or a green-emitting ZnTe0.1Se0.9 single quantum well sandwiched between a ...