| 亚微米级Y3Al5O12∶Ce3+荧光粉的共沉淀法合成、表征及光致发光 |
| Synthesis and Luminescent Characterization of Submicron-sized Y3Al5O12∶Ce3+ Yellow Phosphor by Coprecipitation Method |
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| 摘要: 以金属硝酸盐为原料，使用NH3·H2O-NH4HCO3混合沉淀剂，开展了以反滴化学共沉淀方式和两步煅烧法合成掺铈的钇铝石榴石(Y3Al5O12∶Ce3+)黄色荧光粉研究。采用DTA-TGA和XRD研究共沉淀法制备的前驱体粉末热分解与钇铝石榴石晶相形成过程，通过荧光光谱和SEM研究荧光粉光致发光及添加剂对其发光和形貌影响规律。结果表明，采用化学共沉淀法合成温度比传统高温固相法降低300 ℃以上;荧光粉粒径0.3～1 μm，颗粒规则呈类球状;468 nm激发下荧光粉发射峰为532 nm;煅烧阶段添加氟化物，可使荧光粉的发射强度等发光特性明显提高，对控制Y3Al5O12∶Ce3+荧光粉的形貌有显著作用;与蓝光LED芯片封装后形成的白光LED色温Tc为5 571 K，光效率为45 lm·W-1，显色指数Ra为79.9，色坐标为(0.330 8，0.347 6)。 |
| 关键词: 共沉淀 YAG∶Ce3+ 荧光粉 白光LED |
| 基金项目: |
| Abstract: By using metal nitrates as starting materials， cerium-doped yttrium aluminium garnet (Y3Al5O12∶Ce3+) yellow phosphors were prepared by coprecipitation method with NH3·H2O-NH4HCO3 system as the precipitating agent. The formation process and structure of the phosphor powders were investigated by means of DTA-TGA and XRD. And the effect of fluoride as additive on the morphology， crystallite and photoluminescent properties of Y3Al5O12∶Ce3+ was studied by photoluminescent excitation and emission spectra and SEM. The result shows that completely crystallized phosphors are obtained at 900 ℃， which is more than 300 ℃ lower than the temperature of solid-state method. The phosphor particles have spheroidal shapes with uniform distribution， and their sizes are 0.3～1 μm. The emission spectrum excited by 468 nm shows a characteristic wide band with the peak at about 532nm. A small quantity of fluoride as additive is necessary for enhancing photoluminescent intensity of Y3Al5O12∶Ce3+ phosphors， and improving the morphology. The Y3Al5O12∶Ce3+ phosphors prepared can be used together with a InGaN blue LED to achieve white light when excited by blue light of the LED. The achieved color temperature is 5 571 K， with a device luminous efficacy of 45 lm·W-1， a color rendering index of 79.9 and a color point near the coordinate x=0.330 8， y=0.347 6. |
| Keywords: coprecipitation YAG∶Ce3+ phosphor white LED |
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| 黎学明,陶传义,孔令峰,任晓虎.亚微米级Y3Al5O12∶Ce3+荧光粉的共沉淀法合成、表征及光致发光[J].无机化学学报,2007,23(8):1409-1414. |
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