	US 12,241,009 B2
	Modified phosphors and compositions thereof
Valérie Buissette, Paris (FR); Franck Aurissergues, Argenteuil (FR); and Thierry Le Mercier, Rosny-sous-Bois (FR)
Assigned to RHODIA OPERATIONS, Paris (FR)
Filed by RHODIA OPERATIONS, Aubervilliers (FR)
Filed on Oct. 5, 2021, as Appl. No. 17/494,334.
Application 17/494,334 is a continuation of application No. 15/501,656, abandoned, previously published as PCT/EP2015/067855, filed on Aug. 3, 2015.
Claims priority of application No. 14306234 (EP), filed on Aug. 4, 2014; and application No. 15305178 (EP), filed on Feb. 6, 2015.
Prior Publication US 2022/0098476 A1, Mar. 31, 2022
Int. Cl. C09K 11/02 (2006.01); A01G 9/14 (2006.01); B01J 13/04 (2006.01); C08K 9/04 (2006.01); C09K 11/77 (2006.01); G02F 1/1335 (2006.01); H01L 31/055 (2014.01)

CPC C09K 11/025 (2013.01) [A01G 9/14 (2013.01); B01J 13/04 (2013.01); C08K 9/04 (2013.01); C09K 11/7734 (2013.01); H01L 31/055 (2013.01); C08K 2201/001 (2013.01); C08K 2201/011 (2013.01); Y02E 10/52 (2013.01)]

21 Claims

1. A film consisting of a composition comprising a modified phosphor and at least one polymer,

said modified phosphor comprising phosphor particles and at least one amphiphilic agent coated thereon, wherein the phosphor comprises a silicate having the formula (Vij):

Ba_3(1-x)Eu_3xMg_1-yMn_ySi₂O₈ (Vij)

wherein x and y satisfy the relationships 0<x≤1.0; 0<y≤0.3 and x+y≤1.2,

said modified phosphor having:

an external quantum yield equal to or greater than 40% over an excitation wavelength between 350 nm and 440 nm,

an absorption equal to or less than 15% at a wavelength greater than 440 nm, and

a maximum in the emission spectrum in a range of wavelengths between 440 nm and 900 nm,

said composition, when in the form of a second film having a thickness of about 450 μm, exhibiting:

a haze at 524 nm of less than 35%, the haze being determined according to the relationship:

% haze_{524 nm}=total transmittance (%)_{524 nm}/diffuse transmittance_{524 nm}, and

a total transmittance in the range 450-800 nm of more than 80%, the total transmittance being recorded with UV-VIS spectrometer over a range from 450 to 800 nm with a step of 1 nm.