Abstract: This invention relates to a lighting device comprising a light generation unit (102), which comprises a light emitting diode element (105) having at least one light emitting diode (103), and a light conversion unit (104). The light conversion unit comprises an integral enclosure (110), which encloses a cavity (130), and an organic phosphor element (112) arranged within the cavity. The light generation unit further comprises a base part (114), which includes a thermally conductive material (114) thermally connected with the light emitting diode element. Light generated by the light emitting diode element of the light generation unit is output through the light conversion unit and thereby converted by the organic phosphor element.

Abstract: This invention relates to a lighting device comprising a light generation unit (102), which comprises a light emitting diode element (105) having at least one light emitting diode (103), and a light conversion unit (104). The light conversion unit comprises an integral enclosure (110), which encloses a cavity (130), and an organic phosphor element (112) arranged within the cavity. The light generation unit further comprises a base part (114), which includes a thermally conductive material (114) thermally connected with the light emitting diode element. Light generated by the light emitting diode element of the light generation unit is output through the light conversion unit and thereby converted by the organic phosphor element.

Abstract: The invention pertains to a method of manufacturing a layer of a cholesterically ordered polymer material, in which the material is oriented in such a way that the axis of the molecular helix of the cholesterically ordered material extends transversely to the layer, wherein the method comprises the steps: a) providing a layer comprising a cholesterically ordered mixture of a low-molecular weight polymerizable material and a high-molecular weight material, which high-molecular weight material comprises a quantity of a convertible group, which in its non-converted and in its converted state determines the pitch or the material to a different extent, the conversion of said high-molecular weight material being inducible by radiation, and the layer absorbs said radiation; b) irradiating the layer to convert at least a part of the convertible groups it the irradiated parts of the layer; c) letting at least the low-molecular weight material reorient to form the required helical structure; d) at least partially polym

Abstract: The invention pertains to a phenylethanediol derivative having at least one polymerizable group, characterized in that the phenylethanediol derivative further comprises at least one photo-convertible group for adjusting the helical twisting power of the phenylethanediol derivative. According to a preferred embodiment the phenylethanediol has the formula wherein A stands for a bond or a p-phenylene group; B and B? are independently (O)p—CoH2o—O—CO—CR??CH2, o being 2-12, p being 0 or 1, and R? being H or CH3; P stands for a CH2 or a C?O group; Q and Q? are independently selected from H, C1-C3 alkyl, C1-C3 alkoxy, halogen, and CN; n is an integer from 1 to 3; and m is an integer from 0 to 2; and: wherein A stands for a bond or a p-phenylene group; B is (O)p—CoH2o—O—CO—CR??CH2, o being 2-12, p is 1, and R? being H or CH3; P stands for a CH2 or a C?O group; Q is selected from H, C1-C3 alkyl, C1-C3 alkoxy, halogen, and CN; and m is an integer from 0 to 2.

Abstract: A gas discharge lamp fitted with a gas discharge vessel filled with a gas filling suitable for a gas discharge which emits VUV radiation, with a phosphor coating containing a downconversion phosphor and with means for igniting and maintaining a gas discharge, in which the downconversion phosphor has, in a host lattice, a pair of activators of a first lanthanoid ion and a second lanthanoid ion and a sensitizer selected from the group formed by the thallium(I) ion, lead(II) ion and bismuth(III) ion, is environmentally friendly and has a high lamp efficiency &eegr;lamp.