Light-emitting device with organic electroluminescent material and photoluminescent materials

A light-emitting device comprising:

• (1) light-emitting member that comprises a first electrode and a second electrode and at least one organic EL material disposed between said first and second electrodes, said light-emitting member being disposed on a substrate and emitting first EM radiation having a first spectrum when an electrical voltage is applied across said electrodes, said first spectrum having wavelengths in a range from about 300 nm to about 770 nm;
• (2) at least one layer of at least one organic PL material disposed adjacent to said light-emitting member, said organic PL material absorbing a first portion of said first EM radiation and emitting second EM radiation having a second spectrum having wavelengths in a range from about 500 nm to about 770 nm;
• (3) at least one layer of at least one inorganic PL material disposed adjacent to at least one of said organic EL material and said organic PL material, said inorganic PL material absorbing a second portion of said first EM radiation and emitting third EM radiation having a third spectrum having wavelengths in a range from about 500 nm to about 700 nm;
• and
• (4) a layer comprising at least one light-scattering material disposed in a path of light emitted from said light-emitting member;
• wherein light emitted from said light-emitting device has a correlated color temperature in a range from about 3000 K to about 6500 K.

A light-emitting device comprising:

• (1) a light-emitting member that comprises a first electrode and a second electrode and at least one organic EL material disposed between said first and second electrodes, said light-emitting member being disposed on a substrate and emitting first EM radiation having a first spectrum when an electrical voltage is applied across said electrodes;
• (2) at least one layer of at least one organic PL material disposed adjacent to said light-emitting member, said organic PL material absorbing a first portion of said first EM radiation and emitting second EM radiation having a second spectrum;
• (3) at least one layer containing an additional material selected from the group consisting of:
• (a) at least one inorganic PL material disposed adjacent to at least one of said organic EL material and said organic PL material, said inorganic PL material absorbing a second portion of said first EM radiation and emitting third EM radiation having a third spectrum;
• and
• (b) at least one light-scattering material disposed in a path of light emitted from said light-emitting member;
• and
• (4) a substantially transparent encapsulant layer disposed around an assembly of (1), (2) and (3).

A light-emitting device comprising:

• (1) a light-emitting member that comprises a first electrode and a second electrode and at least one organic EL material disposed between said first and second electrodes, said light-emitting member being disposed on a substrate and emitting first EM radiation having a first spectrum when an electrical voltage is applied across said electrodes, said first spectrum having wavelengths in a range from about 300 nm to about 770 nm;
• (2) at least one layer of at least one organic PL material disposed adjacent to said light-emitting member, said organic PL material absorbing a first portion of said first EM radiation and emitting second EM radiation having a second spectrum having wavelengths in a range from about 500 nm to about 770 nm;
• (3) at least one layer of at least one inorganic PL material disposed adjacent to at least one of said organic EL material and said organic PL material, said inorganic PL material absorbing a second portion of said first EM radiation and emitting third EM radiation having a third spectrum having wavelengths in a range from about 500 nm to about 770 nm;
• and
• (4) a layer containing at least one light-scattering material disposed in a path of light emitted from said light-emitting member;
• wherein light emitted from said light-emitting device has a correlated color temperature in a range from about 3000 K to about 6500 K;
• each of said organic EL material, said at least one organic PL material, and said at least one inorganic PL material covers more than about 10 percent of a surface of said substrate and exhibits continuity to a naked eye;
• said first electrode comprises a material selected from the group consisting of K, Li, Na, Mg, La, Ce, Ca, Sr, Ba, Al, Ag, In, Sn, Zn, Zr, Sm, Eu, alloys thereof, and mixtures thereof;
• said at least one organic EL material is selected from the group consisting of poly(n-vinylcarbazole), poly(alkylfluorene), poly(paraphenylene), polysilanes, derivatives thereof, mixtures thereof, copolymers thereof, 1,3,5-tris{n-(4-diphenylaminophenyl)phenylamino} benzene, phenylanthracene, tetraarylethene, coumarin, rubrene, tetraphenylbutadiene, anthracene, perylene, coronene, aluminum-(picolymethylketone)-bis{2,6-di(t-butyl)phenoxide}, scandium-(4-methoxy-picolymethylketone)-bis(acetylacetonate), aluminumacetylacetonate, gallium-acetylacetonate, and indium-acetylacetonate;
• said second electrode comprises a material elected from the group consisting of ITO, tin oxide, indium oxide, zinc oxide, indium zinc oxide, and mixtures thereof;
• said organic PL material is at least one material selected from the group consisting of perylenes, benzopyrenes, coumarin dyes, polymethine dyes, xanthene dyes, oxobenzanthracene dyes, perylenebis(dicarboximide), pyrans, thiopyrans, and azo dyes;
• said inorganic PL material is at least one material selected from the group consisting of (Y1−xCex)3Al5O12;
• (Y1−x−yGdxCey)3Al5O12;
• (Y1−xCex)3(Al1−yGay)O12;
• (Y1−x−yGdxCey)(Al5−zGaz)O12;
• (Gd1−Cex)Sc2Al3O12;
• Ca8Mg(SiO4)4Cl2:Eu2+,Mn2+;
• GdBO3:Ce3+, Tb3+;
• CeMgAl11O19:
• Tb3+;
• Y2SiO5:Ce3+,Tb3+;
• BaMg2Al16O27:Eu2+,Mn2+;
• Y2O3:Bi3+,Eu3+;
• Sr2P2 O7:Eu2+,Mn2+;
• SrMgP2O7:Eu2+,Mn2+;
• (Y,Gd)(V,B)O4:Eu3+;
• 3.5MgO.0.5MgF2.GeO2:Mn4+(magnesium fluorogerminate);
• BaMg2Al16O27:Eu2+;
• Sr5(PO4)10Cl2:Eu2+;
• BaMg2Al16O27:Eu2+;
• Sr5(P4)10Cl2:Eu2+;
• (Ca,Ba,Sr)(Al,Ga)2S4:Eu2+;(Ba,Ca,Sr)5(PO4)10(Cl,F)2:Eu2+,Mn2+;
• Lu3Al5O12:Ce3+;
• Tb3Al5O12:Ce3+;
• and mixtures thereof;
• wherein 0≦x≦1,0≦y≦, 0≦z≦5 and x+y≦1;
• and said light-scattering material is selected from the group consisting of rutile (TiO2), hafnia (HfO2), zirconia(ZrO2), zircon (ZrO2.SiO2), gadolinium gallium garnet (Gd3Ga5O12), barium sulfate, yttria (Y2O3), yttrium aluminum garnet (“YAG”, Y3Al5O12), calcite (CaCO3), sapphire (Al2O3), diamond, magnesium oxide, germanium oxide.

A method of making a light-emitting device that is based on at least one organic EL material, said method comprising the steps of:

• (1) providing a substrate;
• (2) forming a light-emitting member in a process comprising the steps of:
• (a) depositing a first electrically conducting material on one surface of said substrate to form a first electrode;
• (b) depositing said at least one organic EL material on said first electrode;
• and
• (c) depositing a second electrically conducting material on said organic EL material to form a second electrode;
• and
• (3) disposing at least one organic PL material adjacent to said light-emitting member.

A method of making a light-emitting device that is based on at least one organic EL material, said method comprising the steps of:

• (1) providing a substrate on which a light-emitting member has been formed, said light-emitting member comprising a first electrode, a second electrode, and said at least one organic EL material;
• (2) providing at least one film comprising at least one organic PL material dispersed in a substantially transparent polymeric material;
• and
• (3) laminating said substrate having said light-emitting member together with said at least one film.