... The rapid manufacture of complex three-dimensional micro-scale components has eluded researchers for decades. Several additive manufacturing options have been limited by either speed or the ability to fabricate true ...
... spin-relaxation process. In addition, it is established that the electron spin polarization reaches its maximum value before the first 700 ps of the EL emission. The spin-polarized lightemitting ...
... Quantum Dot white LED (QD WLED) technology may be one of the best choices, due to its higher energy efficiency, larger color render in index, better versatility and more[r] ...
... up to 35000 cd.m -2 . We study the low-temperature performance of the LED and find that there is a delay of droop in terms of current density as temperature decreases. In the last part of the paper, we design a large LED ...
... High-power light-emitting diodes (LEDs) today are twice as powerful as four years ago while meantime their price has been divided by 4 making them promising sources for laser ...LEDs emitting 190 ...
... for top contacts and another Si 3 N 4 passivation layer were deposited. Finally, a two-pair ZnS/Ge dielectric Bragg mirror was deposited by RF sputtering and patterned by a lift-off process. The reflectivity seen from ...
... Conclusion We have successfully developed luminescent composite films based on the mixture of a single-layered hydroxide and organic luminescent dyes. The organic dyes dicyanomethylene and pyranine were chosen according ...
... characterization appeared to be slightly lower than the lattice temperature estimated from the temperature dependency of the bandgap energy. We can speculate that locally within the recombination region the temperature ...
... * Correspondence: maria.tchernycheva@c2n.upsaclay.fr Received: 15 October 2020; Accepted: 12 November 2020; Published: date Abstract: We analyze the thermal behavior of a flexible nanowire (NW) ...
... Organic light-emitting diodes (OLEDs) have attracted signicant attention for broad applications in displays and lighting because of their high electroluminescence (EL) eciency, exibility and low ...
... An ultrawide-bandwidth, superluminescent light-emittingdiode (SLED) utilizing multiple layers of dots of tuned height is reported. Due to thermal effect, the superluminescent phenomenon is observed ...
... of light sources delivering a broad range of more or less adapted light ...these light sources do not in fact deliver a uniform light distribution to the ...
... To evaluate the LED performance, current density–voltage– luminance (J–V–L), EQE-voltage characteristics, and external quantum efficiency spectra are recorded and shown in Fig. 4 . The J–V characteristics [ Fig. 4(a) ] ...
... voltage curve is not that for a diode. Hence, the first scenario is not the case. Has the Au in the upper contact spiked through the active region? Examination o[r] ...
... __________________ * Corresponding author Indeed, these materials have been widely used in optoelectronics [13] and particularly as emitters in OLEDs by several of us [14-17]. The main goal of our work is turned towards ...
... as light outcoupling layers for OLEDs. Low light outcoupling efficiency is an important limiting factor in the OLED technology, especially for blue devices that inherently su ffer from lower photoluminescence ...
... can not be completely ruled out [24], and dopant excitation could arise from a better electron-hole recombination with the carbazole compounds playing the role of the carrier traps according to the trap mechanism [25]. ...
... UV Lightemitting diodes (LEDs) based on Al x Ga 1-x N material are nowadays gaining particular attention due to their potential for replacing mercury lamps, currently used for sterilization and water ...
... 1.4.2 Electroluminescence To describe electroluminescence, we can start with various types of processes that happen in the EL phenomenon. The three major components of the EL process are: the use of an electrical bias ...