Abstract
AbstractIn this work, using Ca10.5(PO4)7 as the structural model, a number of Eu3+‐doped [Ca9Na3xY1‐x(PO4)7 (CNYP‐I, 0 ≤ x ≤ 1/2) ← Ca10.5(PO4)7 → Ca9+yNa3/2‐y/2Y(1‐y)/2(PO4)7 (CNYP‐II, 0 ≤ y ≤ 1)] phosphors were designed and synthesized through the heterovalent substitution of Y3+ and Na+ to Ca2+. The substitution mechanism, composition structure, luminescence performance, and thermal stability of Eu3+‐doped CNYP‐I (0 ≤ x ≤ 1/2) as well as the solid solutions of CNYP‐II (0 ≤ y ≤ 1), were discussed in detail. The morphology and element composition of CNYP‐I (0 ≤ x ≤ 1/2) and CNYP‐II (0 ≤ y ≤ 1) solid solutions were analyzed by SEM and EDS. The PL spectra of the specimens were containing the predominant red peak of emission at 612 nm caused via the transition of 5D0‐7F2, indicating that Eu3+ occupies the low‐symmetry center. Moreover, the site symmetry Eu3+ occupied changed with the x/y value. The luminous intensity of Eu3+‐doped CNYP‐I (0 ≤ x ≤ 1/2) and CNYP‐II (0 ≤ y ≤ 1) phosphors at 150°C maintained about 60% of room temperature. The representative compound CNYP‐I (x = 1/3) was used as the red phosphor to prepare a near‐UV based white LEDs along with Ra of 80.9 and CCT of 4100 K.
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