A light emitting diode, comprising: a first electrode; a second electrode overlapping the first electrode; and an emission layer positioned between the first electrode and the second electrode, wherein the emission layer includes: a first material, the first material including an alkali metal halide, an alkaline earth metal halide, a transition metal halide, an alkali metal chalcogenide, or an alkaline earth metal chalcogenide, and a second material, the second material including a lanthanide metal or a compound of a lanthanide metal wherein the first material includes LiI, NaI, KI, RbI, CsI, FrI, BeI 2, MgI 2, CaI 2, SrI 2, BaI 2, RaI 2, LiCl, NaCl, KCl, RbCl, CsCl, FrCl, LiBr, NaBr, KBr, RbBr, FrBr, MgCl 2, CaCl 2, BaCl 2, SrCl 2, RaCl 2, CaBr 2, BaBr 2, SrBr 2, RaBr 2, MgClBr, CaClBr, BaClBr, SrClBr, RaClBr, MgClI, CaClI, BaClI, SrClI, RaClI, MgBrI, CaBrI, BaBrI, SrBrI, RaBrI, Li 2 S, Na 2 S, K 2 S, Rb 2 S, Cs 2 S, Fr 2 S, Li 2 Se, Na 2 Se, K 2 Se, Rb 2 Se, Cs 2 Se, Fr 2 Se, Li 2 Te, Na 2 Te, K 2 Te, Rb 2 Te, Cs 2 Te, Fr 2 Te, MgS, CaS, BaS, SrS, RaS, MgSe, CaSe, BaSe, SrSe, RaSe, MgTe, CaTe, BaTe, SrTe, RaTe, CuI, AgI, AuI, ZnI 2, NiI 2, PdI 2, PtI 2, CoI 2, RhI 2, IrI 2, FeI 2, RuI 2, IrI 2, FeI 2, RuI 2, OsI 2, MnI 2, TcI 2, ReI 2, CrI 3, MoI 3, WI 3, VI 3, NbI 3, TaI 3, TiI 4, ZrI 4, HfI 4, SnI 2, SnI 4, GeI 2, GeI 4, CuBr, AgBr, AuBr, ZnBr 2, NiBr 2, PdBr 2, PtBr 2, CoBr 2, RhBr 2, IrBr 2, FeBr 2, RuBr 2, IrBr 2, FeBr 2, RuBr 2, OsBr 2, MnBr 2, TcBr 2, ReBr 2, CrBr 3, MoBr 3, WBr 3, VBr 3, NbBr 3, TaBr 3, TiBr 4, ZrBr 4, HfBr 4, CuCl, AgCl, AuCl, ZnCl 2, NiCl 2, PdCl 2, PtCl 2, CoCl 2, RhCl 2, IrCl 2, FeCl 2, RuCl 2, IrCl 2, FeCl 2, RuCl 2, OsCl 2, MnCl 2, TcCl 2, ReCl 2, CrCl 3, MoCl 3, WCl 3, VCl 3, NbCl 3, TaCl 3, TiCl 4, ZrCl 4, or HfCl 4. a first electrode; a second electrode overlapping the first electrode; and an emission layer positioned between the first electrode and the second electrode, wherein the emission layer includes: a first material, the first material including an alkali metal halide, an alkaline earth metal halide, a transition metal halide, an alkali metal chalcogenide, or an alkaline earth metal chalcogenide, and a second material, the second material including a lanthanide metal or a compound of a lanthanide metal a first material, the first material including an alkali metal halide, an alkaline earth metal halide, a transition metal halide, an alkali metal chalcogenide, or an alkaline earth metal chalcogenide, and a second material, the second material including a lanthanide metal or a compound of a lanthanide metal wherein the first material includes LiI, NaI, KI, RbI, CsI, FrI, BeI 2, MgI 2, CaI 2, SrI 2, BaI 2, RaI 2, LiCl, NaCl, KCl, RbCl, CsCl, FrCl, LiBr, NaBr, KBr, RbBr, FrBr, MgCl 2, CaCl 2, BaCl 2, SrCl 2, RaCl 2, CaBr 2, BaBr 2, SrBr 2, RaBr 2, MgClBr, CaClBr, BaClBr, SrClBr, RaClBr, MgClI, CaClI, BaClI, SrClI, RaClI, MgBrI, CaBrI, BaBrI, SrBrI, RaBrI, Li 2 S, Na 2 S, K 2 S, Rb 2 S, Cs 2 S, Fr 2 S, Li 2 Se, Na 2 Se, K 2 Se, Rb 2 Se, Cs 2 Se, Fr 2 Se, Li 2 Te, Na 2 Te, K 2 Te, Rb 2 Te, Cs 2 Te, Fr 2 Te, MgS, CaS, BaS, SrS, RaS, MgSe, CaSe, BaSe, SrSe, RaSe, MgTe, CaTe, BaTe, SrTe, RaTe, CuI, AgI, AuI, ZnI 2, NiI 2, PdI 2, PtI 2, CoI 2, RhI 2, IrI 2, FeI 2, RuI 2, IrI 2, FeI 2, RuI 2, OsI 2, MnI 2, TcI 2, ReI 2, CrI 3, MoI 3, WI 3, VI 3, NbI 3, TaI 3, TiI 4, ZrI 4, HfI 4, SnI 2, SnI 4, GeI 2, GeI 4, CuBr, AgBr, AuBr, ZnBr 2, NiBr 2, PdBr 2, PtBr 2, CoBr 2, RhBr 2, IrBr 2, FeBr 2, RuBr 2, IrBr 2, FeBr 2, RuBr 2, OsBr 2, MnBr 2, TcBr 2, ReBr 2, CrBr 3, MoBr 3, WBr 3, VBr 3, NbBr 3, TaBr 3, TiBr 4, ZrBr 4, HfBr 4, CuCl, AgCl, AuCl, ZnCl 2, NiCl 2, PdCl 2, PtCl 2, CoCl 2, RhCl 2, IrCl 2, FeCl 2, RuCl 2, IrCl 2, FeCl 2, RuCl 2, OsCl 2, MnCl 2, TcCl 2, ReCl 2, CrCl 3, MoCl 3, WCl 3, VCl 3, NbCl 3, TaCl 3, TiCl 4, ZrCl 4, or HfCl 4.