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The composition engineering of red‐emitting Eu 3+ ‐doped Ca 10.5 (PO 4 ) 7 ‐type solid solution phosphors and application in LED
Author(s) -
Wang Jindi,
Huang Shuai,
Yan Yu,
Shang Mengmeng
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17731
Subject(s) - phosphor , doping , solid solution , analytical chemistry (journal) , luminescence , chemistry , thermal stability , crystallography , mineralogy , materials science , nuclear chemistry , chromatography , optoelectronics , organic chemistry
In this work, using Ca 10.5 (PO 4 ) 7 as the structural model, a number of Eu 3+ ‐doped [Ca 9 Na 3x Y 1‐x (PO 4 ) 7 (CNYP‐I, 0 ≤ x ≤ 1/2) ← Ca 10.5 (PO 4 ) 7 → Ca 9+y Na 3/2‐y/2 Y (1‐y)/2 (PO 4 ) 7 (CNYP‐II, 0 ≤ y ≤ 1)] phosphors were designed and synthesized through the heterovalent substitution of Y 3+ and Na + to Ca 2+ . The substitution mechanism, composition structure, luminescence performance, and thermal stability of Eu 3+ ‐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 5 D 0 ‐ 7 F 2 , indicating that Eu 3+ occupies the low‐symmetry center. Moreover, the site symmetry Eu 3+ occupied changed with the x/y value. The luminous intensity of Eu 3+ ‐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.