We have prepared a series of trialkylsilylethynylated anthracenes (a–d) to investigate the effects of solid-state interactions and acene substitution on the electroluminescence spectra of OLED devices. We designed these materials to have differing amounts of -face interactions and various film morphologies. We were particularly interested in intermolecular interactions between aromatic faces, w...

The transient electroluminescence from polymer light-emitting diodes is reported. When the devices are mounted on a microstrip transmission line, the temporal response is limited by the electrode geometry, with rise and fall times below 50 ns. With low duty-cycle pulses (0.5%) the electroluminescence intensity remains proportional to the current at values up to 10 A/cm2, two orders of magnitude...

Electroluminescence allows rapid characterization of an entire photovoltaic solar cell and visualization defects at the micrometer scale. Here we focus on optoelectronic properties silicon interdigitated back contact cells characterized by electroluminescence. The spatially resolved electroluminescence helps us control quality structures used in bottom subcells a three-terminal tandem perovskit...

A new type of electroluminescent device achieves giant stretchability by integrating electronic and ionic components. The device uses phosphor powders as electroluminescent materials, and hydrogels as stretchable and transparent ionic conductors. Subject to cyclic voltage, the phosphor powders luminesce, but the ionic conductors do not electrolyze. The device produces constant luminance when st...

Electroluminescence cooling of a heated infrared-emitting diode has been claimed [P. Santhanam, D. J. Gray, Jr. and R. Ram, Thermoelectrically pumped light-emitting diodes operating above unity efficiency, Phys. Rev. Lett. 108 (2012) 097403]. After analyzing the characteristics this diode, it is evident that electroluminescence was not demonstrated.

High efficiency, solution-processed, organic light emitting devices (OLEDs), using a thermally-activated delayed fluorescent (TADF) emitter, 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN), are fabricated, and the transient electroluminescence (EL) decay of the device with a structure of [ITO/PEDOT: PSS/4CzIPN 5 wt % doped 4,40-N,N0-dicarbazolylbiphenyl(CBP)/bis-4,6-(3,5-di-4-pyridy...