Abstract: Disclosed are an apparatus and a method for Internet of Things (IoT) device security. The method includes unifying a port in a first IoT device for communication, receiving, by the first IoT device, a packet from a second IoT device through the port, identifying whether the packet in the first IoT device is in a preset packet form, verifying content of the packet in the first IoT device when the packet is in the preset packet form, and opening the port for providing a service in the first IoT device when the verifying of the packet content is successful.

Abstract: Disclosed is a linear evaporation source used for forming a thin film for an organic semiconductor device, the linear evaporation source comprising a crucible having a receiving space formed therein, for accommodating an evaporation material and an opening section formed at one side of the crucible in a length direction, wherein the opening section becomes narrow as it travels from both ends to a center portion thereof. If the thin film is formed using the linear evaporation source, a low material use rate of the vacuum evaporation source for the formation of the thin film is improved, thickness uniformity of the deposited thin film throughout the whole area is secured, and shadow effect due to the shadow mask is improved.

Abstract: An organometallic luminescent material comprising the compound of formula (I) of the present invention can emit pure blue light and have high thermal stability: wherein, M1 is a monovalent or tetravalent metal selected from the group consisting of Li, Na, K, Zr, Si, Ti, Sn, Cs, Fr, Rb, Hf, Pr, Pa, Ge, Pb, Tm and Md; R is hydrogen or C1-10 alkyl; B is O, S, Se or Te; D is O or S; and n is an integer ranging from 1 to 4.

Abstract: An organometallic luminescent material comprising the compound of formula (I) of the present invention can emit pure blue light and have high thermal stability: 1

Abstract: An organometallic luminescent material including the compound of formula (IV) emits pure green light and has a high thermal stability: wherein, M4 is a monovalent metal selected from the group consisting of Li, Na, and K; R is hydrogen or a C1-10 alkyl; D is O or S; and n is an integer ranging from 1 to 4.

Abstract: An organometallic luminescent material selected from the group consisting of the compounds of formulae (I) to (V) of the present invention can emit blue, green and red lights.

Abstract: An electroluminescent device comprising a transparent electrode layer, a metallic electrode layer, and an organic interlayer disposed between, and in close contact with, the electrode layers wherein the organic interlayer is comprised of an organic luminescent layer, an optional hole transport layer and an optional electron transport layer, and contains a polyimide of formula (I): wherein A is a moeity derived from a dianhydride compound; B is a moiety derived from a diamine compound; and n is an integer of 2 or higher.

Abstract: An electroluminescent device comprising a transparent electrode layer, a metallic electrode layer, and an organic interlayer disposed between, and in close contact with, the electrode layers wherein the organic interlayer is comprised of an organic luminescent layer, an optional hole transport layer and an optional electron transport layer, and contains a polyimide of formula (I): 1

Abstract: An electroluminescent device comprising a transparent electrode layer, a metallic electrode layer, and an organic interlayer disposed between, and in close contact with, the electrode layers wherein the organic interlayer is comprised of an organic luminescent layer, an optional hole transport layer and an optional electron transport layer, and contains a polyimide of formula (I): 1

Abstract: A process for preparing an organic electroluminescent device having a transparent substrate, a transparent electrode layer, a metallic electrode layer, and an organic interlayer containing an electronically active material dispersed in a matrix of polyimide, characterized in that the organic interlayer is prepared by depositing the vapors of a dianhydride, a diamine and the electronically active material to form a polyimide precursor layer containing the active material dispersed therein and thermally imidizing the polyimide precursor layer. The organic luminescent device thus obtained has improved luminous efficiency, thermal stability, interfacial surface roughness and high bulk density of the layer.

Abstract: An organometallic luminescent material selected from the group consisting of the compounds of formulae (I) to (V) of the present invention can emit blue, green and red lights.

Abstract: An organometallic luminescent material selected from the group consisting of the compounds of formulae (I) to (V) of the present invention can emit blue, green and red lights.

Abstract: An organometallic luminescent material selected from the group consisting of the compounds of formula (I) to (V) of the present invention can emit blue, green and red lights.

Abstract: A novel diamine compound of formula (I) of the present invention having a high glass transition temperature is useful as an improved hole transport agent, and an organic electroluminescent device containing the diamine compound of formula (I) has good thermal and mechanical stabilities, and prolonged lifetime.

Abstract: A novel diamine compound of formula (I) of the present invention having a high glass transition temperature is useful as an improved hole transport agent, and an organic electroluminescent device containing the diamine compound of formula (I) has good thermal and mechanical stabilities, and prolonged lifetime.

Abstract: A process for preparing an organic electroluminescent device having a transparent substrate, a transparent electrode layer, a metallic electrode layer, and an organic interlayer containing an electronically active material dispersed in a matrix of polyimide, characterized in that the organic interlayer is prepared by depositing the vapors of a dianhydride, an electronically, substantially inactive diamine and the electronically active material to form a polyimide precursor layer containing the active material dispersed therein; and thermally imidizing the polyimide precursor layer. The inventive process provides an easy control of luminous efficiency and organic luminescent device thus obtained has improved luminous efficiency, thermal stability, interfacial surface roughness and high bulk density of the layer.

Abstract: A high contrast organic electroluminescent device has a transparent substrate, a transparent electrode layer, a metallic electrode layer, and an organic interlayer disposed between and in close contact with the electrode layers, the organic interlayer being comprised of an organic luminescent layer, an optional hole transport layer and an optional electron transport layer, wherein a dark conductive metal alloy layer is inserted between the organic interlayer and the metallic electrode layer.