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A luminescent substance with the general formula

• XZO4
• where
• X stands for Sca Yb Lac Ced Pre Ndf Smg Euh Gdi Tbk Dyl Hom Ern Tmo Ybp Luq Sb(III)r Bis Crt Mn(III)u Fe(III)v [Baw Mn(II)x Fe(II)y Caz Sn(II)α Srβ Coγ Niδ Cuε]3/2 [NaηKλ]3 [U(IV)μ Pbπ Thσ]3/4 U(VI)φ/2
• and
• Z stands for Nbza Tazb Vzc Pzd [Tize Zrzf Sn(IV)zg]5/4 Wzh5/6 Fe(III)Zi5/3
• and
• a+b+c+d+e+f+g+h+i+k+l+m+n+o+p+q+r+s+t+u+v+3/2(w+x+y+z+α+β+γ+δ+ε)+3(η+λ)+3/4(μ+π+σ)+φ/2=1, and
• a, b, c, d, e, f, g, h, i, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, α, β, γ, δ, ε, η, λ, μ, π, σ and φ each range from 0 to 1, and
• za+zb+zc+zd+5/4 (ze+zf+zg)+5/6zh+5/3zi=1, and
• za, zb, zc, zd, ze, zf, zg, zh and zi each range from 0 to 1. (I)