Provided herein are organic-inorganic hybrid-perovskites, including metal halide perovskites having a 1D crystal structure. The metal halide perovskites may be luminescent. The metal halide perovskites may include a dopant, including an emitter dopant. Methods of forming metal halide perovskites, and devices including the metal halide perovskites also are provided.

In various embodiments a light emitting fiber is provided as well as articles of manufacture comprising one or more light emitting fibers. In certain embodiments the light emitting fiber comprises a conductive carbon nanotube fiber; an emissive layer surrounding the carbon nanotube fiber; and a conductive outer layer disposed outside the emissive layer. In certain embodiments the light emitting fiber comprises a hole transport layer disposed between the carbon nanotube fiber and the emissive layer. In certain embodiments the light emitting fiber comprise a hole injection layer disposed between the nanotube fiber and the hole transport layer. In certain embodiments the light emitting fiber comprises an electron transport layer and, optionally an electron injection layer.

Optoelectronic devices, such as photovoltaic device and light-emitting diode, are provided. The devices include a quasi two-dimensional layered perovskite material and a passivating agent chemically bonded to the quasi two-dimensional layered perovskite material. The passivating agent includes a phosphine oxide compound. An active material is also provided. The active material includes a quasi two-dimensional perovskite compound having outermost edge(s), and a passivating agent chemically bonded to the outermost edge(s). The passivating agent includes a phosphine oxide compound. Methods for manufacturing the optoelectronics devices and the active material are also provided.

An organic light-emitting device includes: a first electrode; a second electrode; and an organic layer disposed between the first electrode and the second electrode, the organic layer having a first emission layer, a second emission layer disposed between the first emission layer and the second electrode, and at least one auxiliary layer, having a first host or a second host, the first emission layer may include a first host, a second host, and a first dopant; and the second emission layer may include a first host, a second host, and a second dopant; wherein the first host is a hole transport host, and the second host may include at least one of an electron transport host and a bipolar host; the first dopant and the second dopant, each may include, independently from one another, at least one of a phosphorescent organometallic compound and a thermally activated delayed fluorescence (“TADF”) compound satisfying Equation 1 as defined herein.

Single-layer LEDs were developed using a composite thin film of organometal halide perovskite (Pero) and poly (ethylene oxide) (PEO). Single-layer Pero LEDs have a device structure that resembles “bottom electrode (ITO)/Pero-PEO/top electrode (In/Ga or Au)”. Green emission LEDs with methylammonium lead bromide (bromide-Pero) and PEO composite thin films exhibit a low turn-on voltage of about 2.8-3.1V (defined at 1 cd m.sup.−2 luminance), a maximum luminance of 4064 cd m.sup.−2 and a moderate maximum current efficiency of about 0.24-0.74 cd A.sup.−1. Blue and red emission LEDs have also been fabricated using Cl/Br or Br/I alloyed Pero-PEO composite thin films.

A method comprising: providing a substrate comprising one or more electronic structures; providing a layer of perovskite overlaying the one or more electronic structures; coating a layer of photoresist material overlaying the layer of perovskite; aligning a mask with the one or more electronic structures and patterning the photoresist material; and using the same etchant to remove sections of the patterned photoresist material and the perovskite underneath the sections of the photoresist material.

Methods and devices for forming painted circuits using multiple layers of electrically conductive paint. In one aspect, a painted circuit includes a substrate (111) and one or more paint layer (106, 108, 110, 112, 114, 116, 120, 122) applied to the substrate, where the one or more paint layers each form an electrical component of the painted circuit. A given paint layer of the one or more paint layers includes a conductive paint formulation having a resistance that is defined by a concentration of conductive material that is included in the conductive paint formulation and a thickness of the given paint layer, and lower concentrations of the conductive material included in the conductive paint formulation provide a higher resistance than higher concentrations of conductive material.

Provided is a light-emitting diode and a method for preparing the same. The light-emitting diode includes an anode, a hole transport layer, a perovskite light-emitting layer, an electron transport layer and a cathode stacked in sequence, in which the perovskite light-emitting layer includes a first sublayer and a second sublayer stacked in sequence, with a material for forming the first sublayer including an inorganic perovskite material, and with a material for forming the second sublayer being an organic perovskite material.

Light emitting electrochemical cell devices comprising chiral liquid crystalline materials. The chiral liquid crystalline material mixtures of the devices function as both electrolytes and as light emitting materials. The chiral liquid crystalline material mixtures also form photonic crystal structures creating a photonic stop band. The presence of the photonic stop band enables the light emitting electrochemical cell devices to emit light with improved energy efficiency.

The present disclosure discloses metal oxide nanoparticle ink, a method of preparing the same, a metal oxide nanoparticle thin film manufactured using the same, and a photoelectric device using the same. The method of preparing metal oxide nanoparticle ink according to an embodiment of the present disclosure includes a step of, using a ligand solution including a metal oxide and an organic ligand, synthesizing a first nanoparticle that is a metal oxide nanoparticle surrounded with the organic ligand; a step of preparing a dispersion solution by dispersing the first nanoparticle in a solvent; a step of preparing a second nanoparticle by mixing the dispersion solution and a pH-adjusted alcohol solvent and then performing ultrasonication treatment to remove the organic ligand surrounding the first nanoparticle; and a step of preparing metal oxide nanoparticle ink by dispersing the second nanoparticle in a dispersion solvent.