Preparation of Novel Rare-Earth-Doped (Oxy)Nitride Phosphor and Evaluation of Characteristics
| Project/Area Number |
20560630
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Sophia University |
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Principal Investigator |
ITATANI Kiyoshi Sophia University, 理工学部, 教授 (90129784)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 窒素化物 / 希土類付活 / 噴霧熱分解法 / 粉体物性 / 蛍光特性 / 炭素熱還元法 / 窒化ケイ素カルシウム / 励起・発光スペクトル / 酸窒化物 |
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| Research Abstract |
In this work, Eu^<2+>-doped alkaline earth silicon nitride (Ca_2Si_5N_8 : 1mol% Eu^<2+> ; (Ca_<0.99>Eu_<0.01>)_2Si_5N_8) was synthesized by carbothermal reduction and nitridation of (oxy) nitride/oxide powder prepared by ultrasonic spray pyrolysis (USP-CRN). The starting solution (0.1mol・dm^<-3>) containing Si_3N_4, Ca(NO_3)_2 and Eu(NO_3)_3 ((Ca+Eu)/Si ratio=0.4) was spray-pyrolyzed at 600℃. After the spray-pyrolyzed powder was mixed with carbon (the ratio of carbon amount to stoichiometric amount ; 1.50), the mixture was heated at a temperature between 1400 and 1550℃ for 2h in N_2 atmosphere. A single phase of Ca_2Si_5N_8 could be obtained when the mixture had been carbothermally nitrided at and above 1500℃. Moreover, the synthesis of (Ca_<0.99>Eu_<0.01>)_2Si_5N_8 was conducted by the USP-CRN technique, using colloidal silica (SiO_2 ; CS), and solid-state reaction (SSR) and CRN. When the black light was irradiated to the (Ca_<0.99>Eu_<0.01>)_2Si_5N_8, the orange light was emitted. The relative emission intensities, compared to the case of YAG, i.e., the standard substance : Y_3Al_5O_<12>:Ce^<3+> (YAG), were : 0.494 (SSR-CRN)>0.452 (USP-CRN : utilization of Si_3N_4 as Si source)>0.0371 (USP-CRN ; utilization of CS as Si sourse). The relative emission intensity of (Ca_<0.99>Eu_<0.01>)_2Si_5N_8) prepared by USP-CRN, using Si_3N_4 as Si source, was almost comparable to that prepared by SSR-CRN. SEM micrograph of this powder heated at 1500℃ for 2h in N_2 atmosphere showed the spherical particles with diameters of around 2・m. Such particles are expected to be available as a phosphor for white-light LED.
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Report
(4 results)
Research Products
(23 results)
