Table 6. The luminescence ratio (R = I(⁵D₀–⁷F₂)/I(⁵D₀–⁷F₁)), η_ET from ZnO QDs to Eu³⁺ ions, chromaticity coordinates (x, y) and the CCT for Eu³⁺-doped ZnO QDs.

Sample	x	y	CCT (K)	R	η ET (%)
Z0	0.164	0.071	1682.06	—	—
Z0.5	0.229	0.141	3010.63	1.24	40.9
Z1	0.244	0.149	3209.27	1.20	54.6
Z3	0.249	0.154	3791.77	1.23	64.73
Z5	0.299	0.211	21957.22	1.36	70.48
Z7	0.276	0.218	30410.34	1.18	75.4