Colloidal quantum dots/perovskites based light-emitting diodes (QLEDs/PeLEDs) have attracted extensive attention for lighting and displayapplications because of their excellent advantages, such as narrow emission ban...
Colloidal quantum dots/perovskites based light-emitting diodes (QLEDs/PeLEDs) have attracted extensive attention for lighting and displayapplications because of their excellent advantages, such as narrow emission bandwidth, color tunability, high brightness and low-cost fabrication techniques. The external quantum efficiencies (EQEs) for QLEDs/PeLEDs are catching up with those for commercial organic light-emitting diodes (OLEDs), thanks to the quantum efficiency improvement, the device configuration optimization as well as the deep understanding of electroluminescence principle. Despite the rapid advance in device performance has been achieved, the operational lifetime of these devices still cannot meet the requirements for practical applications. In this report, we will present our latest advances in improving performance and stability of high color-purity QLEDs/PeLEDs.
In this paper, we propose a new pixel structure for the organic Light Emitting Diode (OLED) 0.65 inch SVGA resolution micro-display with 8 bit gray level. The proposed pixel structure is composed of 4 MOSFETS and one ...
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The effective reduction in the thickness of the metal gate while retaining its defect-free morphology and high dielectric properties is of great interest for producing low-power-consumption and high-performance thin f...
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Utilization of intermolecular Friedel-Crafts and intramolecular condensation reaction,novel 1,3-di-(pyridine-2-yl)benzene(N,C,N terdentate)skeleton with electro-withdrawing group in 6'position of pyridyl and a cyc...
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Utilization of intermolecular Friedel-Crafts and intramolecular condensation reaction,novel 1,3-di-(pyridine-2-yl)benzene(N,C,N terdentate)skeleton with electro-withdrawing group in 6'position of pyridyl and a cyclization between 6'position of pyridyl and 6 position of benzyl ring were firstly designed and *** structures of these novel N,C,N terdentate were confirmed by NMR,MS and X-ray single *** photophysical properties of these compounds were briefly explored.
We investigated the effects of solvents and concentration on the electro-optical performance of the organic light emitting diode (OLED) fabricated by the solution process. From the experimental results, we optimized t...
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Eu3+activated and Eu3+, Tb3+co-activated monodisperse sodium double tungstates NaGd（WO4）2 phosphors were prepared by molten salt method at 750 ℃ for 10 h using NaCl as a flux. The crystal structure and morphology o...
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Eu3+activated and Eu3+, Tb3+co-activated monodisperse sodium double tungstates NaGd（WO4）2 phosphors were prepared by molten salt method at 750 ℃ for 10 h using NaCl as a flux. The crystal structure and morphology of the as-synthesized phosphors were measured by XRD and SEM, respectively. The photoluminescence properties were characterized by PL spectra, decay lifetime and CIE. The presence of NaCl plays an important role in the morphology and luminescence properties. In this work,NaCl and one of the raw material Na2CO3in a certain proportion will form a low eutectic salt to decrease the reaction temperature and benefit the formation of monodisperse NaGd（WO4）2crystals. The color of Eu3+and Tb3+co-doped NaGd（WO4）2phosphors can be tuned from creamy white to orange, red and green by adjusting the doping concentration of rare earth ions, since the emission contain the broad blue-green emission origin from NaGd（WO4）2host and characteristic red and green emission origin from Eu3+and Tb3+ions. The electroluminescent spectra and CIE measurement shows that the LED device with NaGd（1-x）（WO4）2:xEu3+（x = 0.24） phosphor can be excited by 365 nm and 380 nm LED chip, and their CIE coordinate is（x = 0.45, y = 0.45） and（x = 0.36, y = 0.37）, Ra is 80.3 and 86.3, Tcis 3196 and4556 K, respectively. As a single-component phosphor, NaGd（WO4）2:Eu3+,Tb3+have potential application in UV-pumped WLEDs.
In this paper, the Sr-doped In2O3 thin film is fabricated by aqueous route and the stability of InSrO thin film transistor under negative bias illumination stress (NBIS) is investigated. It is found that Sr can effect...
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The lagging development of deep-blue perovskite light-emitting diodes (PeLEDs) heavily impedes their practical applications in full-color display due to the absence of spectrally stable emitters and the mismatch of ca...
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The lagging development of deep-blue perovskite light-emitting diodes (PeLEDs) heavily impedes their practical applications in full-color display due to the absence of spectrally stable emitters and the mismatch of carrier injection capacity. Herein, we report highly efficient deep-blue PeLEDs through a new chemical strategy that addresses the dilemma for simultaneously constant electroluminescence (EL) spectra and high-purify phase in reduced-dimensional perovskites. The success lies in the control of adsorption-energy differences between phenylbutylamine (PBA) and ethylamine (EA) interacting with perovskites, which facilitates narrow n -value distribution. This approach leads to an increased exciton binding energy and enhanced surface potential, hence improving radiative recombination. As a result, an external quantum efficiency of 4.62 % is achieved in PeLEDs with a stable EL peak at 457 nm, demonstrating the best reported result for deep-blue PeLEDs so far.
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