Electronic Two-Transition-Induced Enhancement of Emission Efficiency in Polymer Light-Emitting Diodes
نویسندگان
چکیده
With the development of experimental techniques, effective injection and transportation of electrons is proven as a way to obtain polymer light-emitting diodes (PLEDs) with high quantum efficiency. This paper reveals a valid mechanism for the enhancement of quantum efficiency in PLEDs. When an external electric field is applied, the interaction between a negative polaron and triplet exciton leads to an electronic two-transition process, which induces the exciton to emit light and thus improve the emission efficiency of PLEDs.
منابع مشابه
Effects of polymer sidebranching in double- and single-layer polyfluorene light-emitting diodes
We study how changes in sidebranching in electroluminescent polymers affect the performance of polyfluorene-based light-emitting diodes with and without additional hole transport materials. We observe that light emission and device efficiency are determined more by the position of the exciton recombination zone than by changes in the polymer morphology induced by sidebranching. Consequently, we...
متن کاملElementary approach to calculate quantum efficiency of polymer light emitting diodes
An elementary approach has been suggested to calculate the external quantum efficiency (EQE) of polymer light emitting diodes (PLEDs). This approach requires only the electroluminescence (EL) spectrum and illumination versus current characteristics of the devices to calculate the EQE. In these calculations the light emission has been considered to be perfectly diffusive from the emission surfac...
متن کاملThermally enhanced blue light-emitting diode
Articles you may be interested in Performance enhancement of blue light-emitting diodes with a special designed AlGaN/GaN superlattice electron-blocking layer Appl. Raman and emission characteristics of a-plane InGaN/GaN blue-green light emitting diodes on r-sapphire substrates J. Thermally stable and highly reflective AgAl alloy for enhancing light extraction efficiency in GaN light-emitting d...
متن کاملSpontaneous Emission Extraction and Purcell Enhancement from Thin-Film 2-D Photonic Crystals
Electromagnetic band structure can produce either an enhancement or a suppression of spontaneous emission from two-dimensional (2-D) photonic crystal thin films. We believe that such effects might be important for light emitting diodes. Our experiments were based on thin-film InGaAs/InP 2-D photonic crystals at ambient temperature, but the concepts would apply equally to InGaN thin films, for e...
متن کاملHigh-efficiency polymer light-emitting diodes using neutral surfactant modified aluminum cathode.
High-efficiency polymer light-emitting diodes were fabricated by inserting a layer of nonionic neutral surfactant between the electroluminescent (EL) layer and the high-work-function aluminum cathode via spin coating. It was found that both the poly(ethylene glycol)- and poly(propylene glycol)-based surfactants as well as their copolymers can all demonstrate similar performance enhancement. Dev...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره 6 شماره
صفحات -
تاریخ انتشار 2013