1. A composition comprising a colorant, which colorant is present in a non-fluorescent form and a fluorescent form, wherein the non-fluorescent form of the colorant is a tetrabenzodiazadiketoperylene pigment of formula I
wherein
X, Y, Z and G independently of each other are
C1-12 alkyl or branched alkyl, C3-6 cycloalkyl, C7-12 aralkyl, C6-10 aryl, C3-9 saturated or unsaturated heterocycle, halogen, \u2014OR, CF3, \u2014COOR,\u2014CONR\u2032R, NO2, NR\u2032R, SO3H or SO2NR\u2032R;
R and R\u2032, independently of each other are hydrogen, C1-8 alkyl or branched alkyl, C3-6 cycloalkyl, C6-10 aromatic or C7-12 aralkyl;
and m, n, o and p are independently 0, 1, 2, 3 or 4, when m, n, o or p is 2, 3 or 4, each X, Y, Z or G substituent may each be a different group as defined above;
the fluorescent form of the colorant is also of formula I and is obtained from the non-fluorescent pigment form by exposure to heat and wherein the flourescent form of the pigment is present at a higher concentration in defined domains relative to the remainder of the composition to display an identifiable flourescent marking when exposed to ultraviolet light.
2. A composition comprising a natural or synthetic polymer and a colorant, which colorant is present in a non-fluorescent form and a fluorescent form, wherein the non-fluorescent form of the colorant is a tetrabenzodiazadiketoperylene pigment of formula I according to claim 1, the fluorescent form of the colorant is also of formula I and is obtained from the non-fluorescent pigment form by exposure to heat and wherein the fluorescent colorant is present at different concentrations throughout the composition and displays a fluorescent pattern when exposed to ultraviolet light.
3. A composition according to claim 2, wherein the flourescent form of the pigment is present at a higher concentration in defined domains relative to the remainder of the composition and the defined domains containing a higher concentration of the flourescent form of the pigment is the same color as the remainder of the composition when viewed under ambient visible light conditions.
4. A composition according to claim 2 wherein the polymer comprises a synthetic polymer resin.
5. A composition according to claim 2 which is in the form of a polymeric film or coating.
6. A method for marking a substrate which method comprises incorporating into or applying onto the substrate a composition according to claim 1 comprising a tetrabenzodiazadiketoperylene pigment, and then exposing one or more parts of the substrate to laser radiation or heat to produce a fluorescent marking.
7. A method according to claim 6 which produces on a substrate a fluorescent marking that is not discernable under ambient visible light.
8. A method according to claim 6 which produces on a substrate a fluorescent marking which remains the same color when viewed under ambient visible light as the portion of the substrate which is not so marked.
9. A method according to claim 6 wherein the composition comprising a tetrabenzodiazadiketoperylene pigment is a coating applied to the surface of a substrate.
10. A method according to claim 9 wherein the coating comprises an acrylate polymer.
11. A method for marking a substrate according to claim 6 wherein the fluorescent marking is produced upon exposing one or more parts of the substrate to laser radiation.
12. A laser marked substrate containing flourescent markings resulting from exposure to laser radiation, comprising a substrate which has incorporated therein or applied thereto a composition according to claim 1.
13. A laser marked substrate according to claim 12 wherein the composition comprising a tetrabenzodiazadiketoperylene pigment is a polymeric film or coating applied to the surface of the substrate.
14. A laser marked substrate according to claim 12 wherein the defined florescent markings are the same color when viewed under ambient visible light as the portion of the substrate which does not contain fluorescent laser markings.
15. A laser marked substrate according to claim 13 wherein the polymer composition comprising a tetrabenzodiazadiketoperylene pigment is a coating.
16. A laser marked substrate according to claim 13 wherein the polymer composition comprising a tetrabenzodiazadiketoperylene pigment is a polymeric film.
17. A Composition comprising a natural or synthetic polymer and an effective amount of a fluorescent dye of formula I which composition produces a non-fluorescent marking upon exposure to heat
wherein
X, Y, Z and G independently of each other are
C1-12 alkyl or branched alkyl, C3-6 cycloalkyl, C7-12 aralkyl, C6-10 aryl, C3-9 saturated or unsaturated heterocycle, halogen, \u2014OR, CF3, \u2014COOR,\u2014CONR\u2032R, NO2, NR\u2032R, SO3H or SO2NR\u2032R;
R and R\u2032, independently of each other are hydrogen, C1-8 alkyl or branched alkyl, C3-6 cycloalkyl, C6-10 aromatic or C7-12 aralkyl;
and m, n, o and p are independently 0, 1, 2, 3 or 4, when m, n, o or p is 2, 3 or 4, each X, Y, Z or G substituent may each be a different group as defined above.
18. A method for marking a substrate which method comprises incorporating into or applying onto the substrate a composition according to claim 17, and then exposing one or more parts of the substrate to laser radiation or heat.
19. A laser marked substrate obtained by the method according to claim 18.
20. A tetrabenzodiazadiketoperylene compound of formula I
wherein
X, Y, Z and G independently of each other are C1-12 alkyl or branched alkyl, C3-6 cycloalkyl, C7-12 aralkyl, C6-10 aryl, C3-9 saturated or unsaturated heterocycle, halogen, \u2014OR, CF3, \u2014COOR,\u2014CONR\u2032R, NO2, NR\u2032R, SO3H or SO2NR\u2032R;
R and R\u2032, independently of each other are hydrogen, C1-8 alkyl or branched alkyl, C3-6 cycloalkyl, C6-10 aromatic or C7-12 aralkyl;
m is 1, 2, 3 or 4;
n, o and p are independently 0, 1, 2, 3 or 4,
and when m, n, o or p is 2, 3 or 4, each X, Y, Z or G substituent may each be a different group as defined above.
21. A composition comprising a natural or synthetic polymer and a compound according to claim 20.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A detector device comprising:
a) an assembly with a first layer of scintillation crystals for converting gamma radiation photon energy to light and a second layer of scintillation crystals for converting gamma radiation photon energy to light;
b) a first light guide sandwiched between said second layer and said first layer and used for coupling said first ad second layers so that the light coming from the second layer is distributed broader than the light originating from the first layer;
c) a photo detector array for measuring the light generated in the scintillation crystals, said assembly being mounted with a second light guide onto said photo detector array, said second light guide beam sandwiched between said photo detector array and said first layer and used for coupling said first layer and said photo detector array; and
d) optical compartments forming a sub-structure of said scintillation crystals and covering side surfaces of said scintillation crystals by a reflective layer.
2. (canceled)
3. The device according to claim 1, further comprising light guides structured with at least one of a groove and a composition of a plurality of individual light guides.
4. The device according to claim 1, wherein the scintillation crystals comprise at least one of a groove and a composition of several individual crystals.
5. The device according to claim 1, wherein the surfaces of at least one of the light guides and the scintillation crystals are polished or rough, grinded, lapped, omnidirectional or scratched in certain directions on at least one face.
6. The device according to claim 1, wherein a pitch of said optical compartments is adapted to a sensor die pitch of said photo detector array.
7. The device according to claim 6, wherein said sensor die pitch of said photo detector array comprises a time-to-digital converter for time stamping.
8. The device according to claim 1, wherein said optical compartments are adapted to provide reflectors in a first or second direction in said second layer and no reflectors in said first layer, wherein said first direction is perpendicular to said second direction.
9. The device according to claim 1, wherein said optical compartments are adapted to provide reflectors in a first direction only in said second layer and reflectors in a second direction only in said first layer, or vice versa, wherein said first direction is perpendicular to said second direction.
10. The device according to claim 1, wherein said optical compartments are square or rectangular at any multiple sensor pitch size or independent from the sensor pitch.
11. The device according to claim 1, wherein the crystal pitch in said first layer differs from the crystal pitch in said second layer.
12. The device according to claim 1, wherein the crystal pitch in a crystal layer differs in a first and second direction and wherein said first direction is perpendicular to said second direction.
13. (canceled)
14. The device according to claim 1, where the photo detector array is connected w said first layer for readout and said first layer is an inner layer of said detector device;
15. An imaging system for imagirig an object, wherein said imaging system comprises a detector device according to claim 1.