為了增強Y6WO12:Eu3+螢光粉的發光性質，本研究檢討助熔劑的添加對合成螢光粉顆粒大小及其光致發光特性之影響。選用的助熔劑包括NH4Cl、NaCl、NaCl/NaNO3及Na2WO4。實驗是將氧化物原料與助熔劑混合均勻後，於空氣中1300℃/6h煆燒而成螢光粉。
1300℃/6h合成的Eu0.3Y5.7WO12螢光粉體，其晶粒是隨著助融劑的添加有明顯的成長，放光強度亦隨助熔劑添加量之增加而提高。助熔劑添加量過多時，晶粒成長會受到抑制，使得放光強度明顯降低。添加2 wt% NH4Cl所得之Eu0.3Y5.7WO12螢光粉，其發光強度增加25.2%；添加8 wt% NaCl及8 wt% NaCl/NaNO3之Eu0.3Y5.7WO12螢光粉，其發光強度分別增加30.1及36.7%；而添加90 wt% Na2WO4之Eu0.3Y5.7WO12螢光粉，其顆粒尺寸增大至9.47µm，發光強度因而增加254%。
添加不同助熔劑之Eu0.3Y5.7WO12螢光粉其5D0 → 7F2( 605 nm )衰退時間均在0.9~1.0 ms之間，並沒有明顯縮短的情況，此表示無非輻射能量傳遞的發生。添加不同助熔劑的Eu0.3Y5.7WO12螢光粉其非對稱指數( 5D0 → 7F2 / 5D0 → 7F1 強度比值)均約為3，因此EuxY6-xWO12螢光粉的5D0 → 7F2(605 nm)放射強度高於5D0 → 7F1(588 nm)之放射強度。
添加助熔劑Na2WO4經1300℃/6 h合成的Eu0.3Y5.7WO12螢光粉其CIE色度座標為(0.62, 0.33)，相當接近國際標準紅光的座標(0.67, 0.33)。
關鍵字：螢光粉、助熔劑、顆粒尺寸、光致發光、非對稱指數、衰退時間、Na2WO4

In this study, in order to enhance the luminescence properties of red phosphors, effect of fluxes on the particle sizes and photoluminescence properties of Y6WO12:Eu3+ phosphors were investigated. NH4Cl, NaCl, NaCl/NaNO3 and Na2WO4 were selected as Flux materials. Phosphor were sythesized using mixtures of raw oxide powders and flux, and calcined at 1300°C for 6h in air.
The PL emission intensity of Eu0.3Y5.7WO12 phosphor of 5D0 → 7F2 transition increased with flux contents. However, it decreased obviously due to the excess flux inhibiting grain growth. The PL emission intensity of 5D0→ 7F2 transition of Eu0.3Y5.7WO12 phosphor with 2wt% NH4Cl increased 25.2%；and the PL emission intensity of 5D0 → 7F2 transition of Eu0.3Y5.7WO12 with 8wt% NaCl and with 8wt% NaCl/NaNO3 increased 30.1 and 36.7% respectively. While the PL emission intensity of 5D0 → 7F2 transition of Eu0.3Y5.7WO12 with 90wt% Na2WO4 increased 254%, owing to the increase of particle size obviously.
The decay time of Eu0.3Y5.7WO12 phosphor with different flux of 5D0→ 7F2 transition was about 0.9~1.0 ms, and the decay time did not descend obviously, which means the nonradiative energy transfer did not happened in Eu0.3Y5.7WO12 phosphors with different flux. The asymmetry ratio ( 5D0 → 7F2 / 5D0 → 7F1 ) of Eu0.3Y5.7WO12 phosphors with different flux were about 3, which induced the higher PL emission intensity of Eu0.3Y5.7WO12 phosphor with different flux of 5D0 → 7F2 transition than that of 5D0 → 7F1 transition. The chromaticity coordinate of the Eu0.3Y5.7WO12 phosphor prepared by flux Na2WO4 was at (0.62, 0.33), which near the chromaticity coordinates of the standard red color (0.67, 0.33).
Key word：phosphor、flux、particle size、Photo-luminescence、 Asymmetry ratio、concentration quenching、decay time、Na2WO4

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