a＇-Sr2SiO4：Eu2＋ phase always coexists with the Sr3SiO5：Eu2＋ phase when it is synthesized by a high-temperature solid-state method. This may affect the luminescent properties of the Sr3SiO5：Eu2＋ phosphors. We in...a＇-Sr2SiO4：Eu2＋ phase always coexists with the Sr3SiO5：Eu2＋ phase when it is synthesized by a high-temperature solid-state method. This may affect the luminescent properties of the Sr3SiO5：Eu2＋ phosphors. We investigated the decomposition reaction of Sr3SiO5 during the cooling process with the quenching method. The results indicated that Sr3SiO5 was a stable compound above 1250℃. The Sr3SiO5 phase decomposed into a＇-Sr2SiO4 and SrO below 1250℃. The a＇-Sr2SiO4：Eu2＋ phase would coexist with the Sr3SiOs：Eu2＋ phase because of the decomposition reaction of Sr3SiO5, making the luminescent wavelength of coexistence sample move to the short-wavelength compared with the luminescent wavelength of Sr3SiO5：Eu2＋. Pure phase Sr3SiO5：Eu2＋ could be obtained by the rapid cooling method to suppress Sr3SiO5 decomposition. When the cooling rate was 20℃/min, nearly pure phase Sr3SiO5：Eu2＋ could be produced.展开更多
基金supported by Jilin Provincial Science and Technology Department(20090348,20080511,20101117)Jilin Province Project Development and Reform Commission(2011FGW03)the "Eleventh-Five" Science and Technology Project of Jilin Province Education Department(200938)
文摘a＇-Sr2SiO4：Eu2＋ phase always coexists with the Sr3SiO5：Eu2＋ phase when it is synthesized by a high-temperature solid-state method. This may affect the luminescent properties of the Sr3SiO5：Eu2＋ phosphors. We investigated the decomposition reaction of Sr3SiO5 during the cooling process with the quenching method. The results indicated that Sr3SiO5 was a stable compound above 1250℃. The Sr3SiO5 phase decomposed into a＇-Sr2SiO4 and SrO below 1250℃. The a＇-Sr2SiO4：Eu2＋ phase would coexist with the Sr3SiOs：Eu2＋ phase because of the decomposition reaction of Sr3SiO5, making the luminescent wavelength of coexistence sample move to the short-wavelength compared with the luminescent wavelength of Sr3SiO5：Eu2＋. Pure phase Sr3SiO5：Eu2＋ could be obtained by the rapid cooling method to suppress Sr3SiO5 decomposition. When the cooling rate was 20℃/min, nearly pure phase Sr3SiO5：Eu2＋ could be produced.
