High quantum efficiencies and low current thresholds are important properties for all classes of semiconductor light emitting devices (LEDs), including nanoscale emitters based on single wall carbon nanotubes (SWNTs). Among the various configurations that can be considered in SWNT LEDs, two terminal geometries with asymmetric metal contacts offer the simplest solution. In this paper, we study, ...

We carried out degradation analysis of a blue phosphorescent organic light emitting diode by both impedance spectroscopy and transient electroluminescence (EL) spectroscopy. The number of semicircles observed in the Cole-Cole plot of the modulus became three to two after the device was operated for 567 hours. Considering the effective layer thickness of the initial and degraded devices did not ...

The continuous tuning of the emission spectrum of a single light-emitting diode (LED) by an external electrical bias is of great technological significance as a crucial property in high-quality displays, yet this capability has not been demonstrated in existing LEDs. Graphene, a tunable optical platform, is a promising medium to achieve this goal. Here we demonstrate a bright spectrally tunable...

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The nature of hot electron electroluminescence (EL) in AlGaN/GaN high electron mobility transistors is studied and attributed to Bremsstrahlung. The spectral distribution has been corrected, for the first time, for interference effects due to the multilayered device structure, and this was shown to be crucial for the correct interpretation of the data, avoiding artefacts in the spectrum and mis...

The electroluminescent properties of narrow-gap type II InAs/InSb/InAs heterostructures containing a single layer InSb quantum dots placed at the interface p-n junction in InAs were studied. features electroluminescence spectra depending on surface density nanoobjects broken-gap heterointerface investigated both forward and reverse bias. When applying bias to under study, suppression negative i...

PeLEDs based on S?SS-modified CsPbBr 3 NCs showed a bright green electroluminescence and narrow emission bandwidth.

Aromatic-imide-based TADF emitters were developed by using a 9-fluorenyl substitution strategy and demonstrated stable sky blue electroluminescence with nearly 30% EQE.