LED SYSTEM

Abstract

LED system comprising a sealed internal volume containing one or more elements sensitive to the presence of Volatile Organic Compounds (VOCs), wherein in said internal volume is present a getter composition for VOCs removal comprising a combination of at least two different types of zeolite.

Claims

1-17. (canceled)

18. An LED system comprising a sealed internal volume comprising a getter composition for Volatile Organic Compounds (VOCs) removal that comprises a zeolite materials combination comprising Linde type A (LTA) zeolites and at least one zeolite material selected from the group consisting of Mordenite Framework Inverted (MFI), Faujasite 13X, and Mordenite, wherein said Linde type A (LTA) zeolites are present in an amount comprised between 4 wt. % and 25 wt. %, and wherein, in addition to said getter composition for VOCs removal, an oxygen releasing composition is present in said sealed internal volume.

19. The LED system according to claim 18, wherein said getter composition for VOCs removal comprises the zeolite materials in amounts given by the formula:
(MFI).sub.x+(Faujasite 13X).sub.y+(Mordenite).sub.z+(LTA).sub.d wherein indexes x, y, z, d are the wt. % of the zeolite types in the getter composition for VOCs removal, and wherein: x is comprised between 0 and 80; y is comprised between 0 and 90; z is comprised between 0 and 60; d is comprised between 4 and 25; and x+y+z+d is 100.

20. The LED system according to claim 18, wherein the amount of said getter composition for VOCs removal per unit of free internal volume is comprised between 0.04 mg/cm.sup.3 and 0.60 mg/cm.sup.3.

21. The LED system according to claim 18, wherein the zeolites in said getter composition for VOCs removal have a surface area greater than 700 m.sup.2/g and pore dimension equal to or greater than 4 Angstroms.

22. The LED system according to claim 18, wherein said getter composition for VOCs removal is capable of removing silanols and/or siloxanes.

23. The LED system according to claim 18, wherein said oxygen releasing composition is at least one selected from the group consisting: of MgO.sub.2; Mg.sub.xZn.sub.yO.sub.2, where the sum of x+y=1; CaO.sub.2; ZnO.sub.2; Li.sub.2O.sub.2; Na.sub.2CO.sub.3: 1.5H.sub.2O.sub.2; NaBO.sub.3: nH.sub.2O; KMnO.sub.4; and Ca(MnO.sub.4).sub.2.

24. The LED system according to claim 18, wherein the amount of said oxygen releasing composition per unit of free internal volume is comprised between 0.05 mg/cm.sup.3 and 2.0 mg/cm.sup.3.

25. The LED system according to claim 18, further comprising CaO in an amount comprised between 0.03 mg/cm.sup.3 and 1.5 mg/cm.sup.3 per unit of free internal volume.

26. The LED system according to claim 18, wherein said getter composition for VOCs removal is in the form of powders having an average particle size less than 200 m.

27. The LED system according to claim 18, wherein said getter composition for VOCs removal is in the form of powders, and said powders are alternatively: pressed in a container, optionally comprising a retaining inorganic aid in an amount comprised between 20 wt. % and 80 wt. %; or compressed in the form of stand-alone pills or tablets, optionally comprising a retaining inorganic aid in an amount comprised between 20 wt. % and 80 wt. %; or retained by an inorganic matrix, wherein the amount of said inorganic matrix is higher greater than 50 wt. %; or contained within a gas-permeable polymeric envelope; or dispersed within an organic matrix.

28. The LED system according to claim 27, wherein said getter composition for VOCs removal is mixed with said oxygen releasing composition, and wherein said oxygen releasing composition is at least one selected from the group consisting: of MgO.sub.2; Mg.sub.xZn.sub.yO.sub.2, where the sum of x+y=1; CaO.sub.2; ZnO.sub.2; Li.sub.2O.sub.2; Na.sub.2CO.sub.3: 1.5H.sub.2O.sub.2; NaBO.sub.3: nH.sub.2O; KMnO.sub.4; and Ca(MnO.sub.4).sub.2.

29. The LED system according to claim 18, wherein said LED system is a light emitting device or a light driven device.

30. The LED system according to claim 18, wherein the amount of said getter composition for VOCs removal per unit of free internal volume is comprised between 0.06 mg/cm.sup.3 and 0.40 mg/cm.sup.3.

31. The LED system according to claim 18, wherein the amount of said oxygen releasing composition per unit of free internal volume is comprised between 0.15 mg/cm.sup.3 and 1.50 mg/cm.sup.3.

32. The LED system according to claim 18, wherein said getter composition for VOCs removal is in the form of powders having an average particle size less than 100 m.

33. The LED system according to claim 18, wherein said getter composition for VOCs removal is in the form of powders, and said powders are alternatively: pressed in a container, optionally comprising a retaining inorganic aid in an amount comprised between 20 wt. % and 80 wt. %, wherein the retaining inorganic aid is at least one selected from the group consisting of a Cu alloy, an Sn alloy, kaolinite, and a montmorillonite clay; or compressed in the form of stand-alone pills or tablets, optionally comprising a retaining inorganic aid in an amount comprised between 20 wt. % and 80 wt. %, wherein the retaining inorganic aid is at least one selected from the group consisting of a Cu alloy, an Sn alloy, kaolinite, and a montmorillonite clay; or retained by an inorganic matrix, wherein the amount of said inorganic matrix is comprised between 60 wt. % and 90 wt. % and said inorganic matrix is at least one selected from the group consisting of a Cu alloy, an Sn alloy, kaolinite, and a montmorillonite clay; or contained within a gas-permeable polymeric envelope, said envelope being made of at least one selected from the group consisting of high density polyethylene (HDPE), low density polyethylene (LDPE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), and polyvinyl chloride (PVC); or dispersed within an organic matrix selected from the group consisting of polyester epoxy resins, epoxy-acrylic resins, acrylic resins, polyurethane resins, siloxane matrices, silicone grease, polyimide, polyamide resins, and silicone based resins.

Description

[0043] The invention will be further illustrated with the help of the following non limiting examples evaluating the relative performance for toluene sorption of samples consisting in metallic rings containing pressed powder mixtures of the compositions detailed in table 1, where sample S1, (MFI).sub.20+(Faujasite 13X).sub.45+(Mordenite).sub.20+(LTA).sub.15, made according to the present invention, is used as reference.

[0044] The characterizations tests have been carried out measuring, by means of a microbalance, the sorption capacity for toluene, kept at a constant pressure of 1 mbar and at room temperature, this test was carried out for the samples encompassed by the present invention (S1-53) and for three comparative examples (C1-C3) not encompassed by the present invention.

TABLE-US-00001 TABLE 1 Samples compositions and their relative sorption performances with respect to reference sample S1 MFI Faujasite Mordenite LTA Relative capacity Sample ID wt. % 13X wt. % wt. % wt. % with respect to S1 S1 20 45 20 15 S2 30 35 30 5 Comparable S3 23 40 15 22 Comparable C1 20 35 15 30 Inferior C2 20 35 44 1 Inferior C3 35 15 20 30 Substantially inferior

[0045] In table 1 the term comparable indicates a difference in the capacity within 7,5% with respect to the reference S1, inferior indicates a reduced capacity from 10% to 30% with respect to S1, substantially inferior a reduced capacity equal to or higher than 30% with respect to S1.

[0046] It is possible to observe that the compositions according to the present invention S1-S3, have comparable capacity, while all three comparative examples C1-C3, having a LTA zeolite wt. % outside the range of the present invention, C1 and C3 higher, C2 lower, have worsened performances in terms of toluene removal overall capacity.