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Light emitting diode

InactiveUS20100187550A1Enhancing recombinationIncrease in the electron barrierSemiconductor devicesLight emitting deviceLight-emitting diode
In a preferred embodiment, a light emitting device comprising: a polar template; a p-type layer grown on the polar template; the p-type layer having a first polarization vector; the first polarization vector having a first projection relative to a growth direction; an n-type layer grown on the p-type layer; the n-type layer having a second polarization vector; the second polarization vector having a second projection relative to said growth direction that is larger than the first projection of the first polarization vector for the p-type layer; the n-type layer and p-type layer forming an interface; whereby the first polarization vector in the p-layer and second polarization vector in the n-layer create a discontinuity at the interface resulting in a negative charge appearing at the interface. In another preferred embodiment, a light emitting device comprising: a polar template; a n-type layer grown on the template; the n-type layer having a first polarization vector; the first polarization vector having a first projection relative to a growth direction; an p-type layer grown on the n-type layer; the p-type layer having a second polarization vector; the second polarization vector having a second projection relative to said growth direction that is larger than the first projection of the first polarization vector for the p-type layer; the n-type layer and p-type layer forming an interface; whereby the first polarization vector in the p-layer and second polarization vector in the n-layer create a discontinuity at the interface resulting in a negative charge appearing at the interface.
Owner:ARMY US SEC THE THE

Encapsulation for an electronic thin film device

The present invention relates to an encapsulation for an electronic thin film device, comprising a first barrier layer (108), a second barrier layer (112), and a first planarization layer (110′) for reducing the formation of pinholes in a subsequent barrier layer, said first planarization layer (110′) arranged between the first barrier layer (108) and the second barrier layer (112), wherein the first planarization layer (110′) is composed of a first plurality of planarization segment (114) having areas formed between each other, and the encapsulation further comprises a second planarization layer (116) arranged between the second barrier layer (112) and a third barrier layer (120), wherein the second planarization layer (116) is composed of a second plurality of planarization segments (118) arranged to extend over the areas between the first plurality of planarization segments (114), thereby further reducing the number of pinholes providing passageways through the encapsulation. According to the invention, by arranging the barrier layers and the planarization layers in a horizontal multi-layer encapsulation stack, where planarization segments in each of the layers are essentially decoupled from each other and in practice non-interconnecting with each other, it is possible to limit the lateral transportation of water and oxygen through the planarization layer. Instead, if water/oxygen enters the top barrier layer, and eventually a planarization segment, it is contained in the “sphere” of a planarization segment, having a minimized possibility of entering a pinhole in a subsequent barrier layer. The present invention also relates to corresponding method for the formation of an encapsulation for an electronic thin film device.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV

Organic electroluminescence device

[Object] It is an object of the present invention to provide an organic compound having excellent properties such as excellent hole injection/transport performance, electron blocking performance, high stability in a thin-film state, and high light emission efficiency as a material for a highly efficient organic EL device having a high durability, and a highly efficient organic EL device having a high durability by using this compound.
[Solving Means] An organic EL device, including, between an anode and a cathode, at least a first hole transport layer, a second hole transport layer, a green light-emitting layer, and an electron transport layer in the stated order from a side of the anode, the organic EL device being characterized in that, the second hole transport layer, or at least one of stacked films disposed between the first hole transport layer and the electron transport layer contains an arylamine compound represented by the following general formula (1).
(In the formula, Ar1, Ar2, Ar3, and Ar4 may be the same as or different from each other, and each represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted fused polycyclic aromatic group. L1 represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted aromatic heterocyclic, or a divalent group of a substituted or unsubstituted fused polycyclic aromatic. R1, R2, and R3 each represent a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, a cyano group, a nitro group, a linear or branched alkyl group having 1 to 6 carbon atoms which may have a substituted group, a cycloalkyl group having 5 to 10 carbon atoms which may have a substituted group, a linear or branched alkenyl group having 2 to 6 carbon atoms which may have a substituted group, a linear or branched alkyloxy group having 1 to 6 carbon atoms which may have a substituted group, a cycloalkyloxy group having 5 to 10 carbon atoms which may have a substituted group, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted fused polycyclic aromatic group, or a substituted or unsubstituted aryloxy group. n represents an integer of 1 to 3.)
Owner:HODOGAYA KAGAKU IND
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