Films with narrow band emission phosphor materials
A color conversion film is provided. The film includes at least one narrow band emission phosphor dispersed within a binder matrix, wherein the narrow band emission phosphor has a D50 particle size from about 0.1 μm to about 15 μm and is selected from the group consisting of a green-emitting U 6+ -containing phosphor, a green-emitting Mn 2+ -containing phosphor, a red-emitting phosphor based on complex fluoride materials activated by Mn 4+ , and a mixture thereof. A device is also provided.
1. A film comprising at least one phosphor dispersed within a binder matrix, wherein the phosphor has a D50 particle size from about 0.1 μm to about 15 μm and is selected from the group consisting of a green-emitting U 6+ -containing phosphor, a green-emitting Mn 2+ -containing phosphor, a red-emitting phosphor based on complex fluoride materials activated by Mn 4+ , and a mixture thereof.
2. The film according to claim 1 , wherein the film is substantially free of uniformity defects.
3. The film according to claim 1 , wherein phosphor has a D50 particle size from about 0.1 μm to about 10 μm.
4. The film according to claim 1 , wherein the binder matrix comprises a binder material selected from the group consisting of: diazonaphthoquinone, ethyl cellulose, novolac resin, poly(methyl acrylate), polyvinyl alcohol, polyvinyl butyral, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylpyrrolidone, ethoxylated trimethylolpropane triacrylate, polymethyl methacrylate, propoxylated trimethylolpropane triacrylate, pentaacrylate ester, silicone materials, thiol-ene polymer, and mixtures thereof.
5. The film according to claim 1 , wherein the binder matrix comprises a thermally cured resin, a UV cured resin or a photoresist material.
6. The film according to claim 1 , wherein the at least one phosphor has a D50 particle size from about 0.1 μm to about 10 μm and the film further comprises metal oxide nanoparticles and scattering particles having a particle size from about 1 μm to about 10 μm.
7. The film according to claim 1 , wherein the film further comprises quantum dot materials or color filter pigments capable of absorbing blue light.
8. The film according to claim 1 further comprising one or more additives selected from the group consisting of: a dispersant, a rheology modifier, an electrolyte, metal oxide nanoparticles, scattering particles and mixtures thereof.
9. The film according to claim 1 , wherein the binder matrix comprises metal oxide nanoparticles.
10. The film according to claim 8 , wherein the rheology modifier comprises a gelator.
11. The film according to claim 1 further comprising scattering particles having a particle size greater than 1 μm and wherein the scattering particles are selected from the group consisting of: Al 2 O 3 , zirconium oxide, indium tin oxide, cerium oxide, tantalum oxide, titanium dioxide, zinc oxide and a combination thereof.
12. The film according to claim 8 , wherein the metal oxide nanoparticles are selected from the group consisting of: zirconium oxide, indium tin oxide, cerium oxide, tantalum oxide, titanium dioxide, zinc oxide and a combination thereof.
13. The film according to claim 1 , wherein the at least one phosphor comprises a green-emitting U 6+ -containing phosphor selected from the group consisting of: γ-Ba 2 UO 2 (PO 4 ) 2 , [Ba,Zn,Mg](UO 2 ) 2 (PO 4 ) 2 , Ba 6 Al 5 P 5 O 26 :U 6+ , Ba(UO 2 )P 2 O 7 , Ba 3 (UO 2 ) 2 P 2 O 7 (PO 4 ) 2 , and combinations thereof.
14. The film according to claim 1 , wherein the at least one phosphor comprises a phosphor of formula I
A x MF y :Mn 4+ (I)
wherein
A is Li, Na, K, Rb, Cs, or a combination thereof;
M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof;
x is an absolute value of a charge of the MF y ion; and
y is 5, 6 or 7.
15. The film according to claim 14 , wherein the phosphor of formula I is K 2 SiF 6 :Mn 4+ or Na 2 SiF 6 :Me.
16. The film according to claim 14 , wherein the binder matrix has a higher refractive index than the phosphor.
17. The film according to claim 14 , wherein the at least one phosphor is at least partially coated with a surface coating comprising a metal fluoride or a silica.
18. The film according to claim 14 , wherein the metal fluoride is selected from the group consisting of MgF 2 , CaF 2 , SrF 2 , BaF 2 , AgF, ZnF 2 , AlF 3 , and a combination thereof.
19. An article comprising a substrate; a plurality of light sources disposed on the substrate, each spatially separated; the film according to claim 1 disposed on at least a portion of the plurality of light sources; and a non-transmissive region surrounding at least a portion of the plurality of light sources.
20. The article according to claim 19 , wherein at least a portion of the plurality of light sources is a UV or blue LED.
21. The article according to claim 19 , wherein the non-transmissive region has an optical density of at least 2.0.
22. The article according to claim 19 , wherein the non-transmissive region comprises black matrix material comprising non-transmissive materials dispersed in a black matrix binder.
23. The article according to claim 19 , wherein the non-transmissive materials comprise carbon black particles, dielectric oxides or metal particles selected from the group consisting of Ni, Co, Fe, Cr, Cu, Pd, Au, Pt, Sn, Zn and a combination thereof.
24. A device comprising an LED light source optically coupled and/or radiationally connected to the film according to claim 1 .
25. A backlight apparatus comprising the device according to claim 24 .
26. A lighting apparatus comprising the device according to claim 24 .
27. A television comprising the backlight apparatus of claim 25 .
28. A mobile phone comprising the backlight apparatus of claim 25 .
29. A computer monitor comprising the backlight apparatus of claim 25 .
30. The device according to claim 24 , wherein the LED light source comprises a mini-LED or a micro-LED.