| 引用本文: | 王春伟,王亚雄,梁洁,李燕,明俊宇,黄映恒,廖森.具有高的热稳定性的红光荧光粉NaGdF4∶Eu3+的研究[J].材料科学与工艺,2021,29(6):35-41.DOI:10.11951/j.issn.1005-0299.20210019. |
| WANG Chunwei,WANG Yaxiong,LIANG Jie,LI Yan,MING Junyu,HUANG Yingheng,LIAO Sen.Study on the high thermal stability of red emitting phosphor NaGdF4∶Eu3+[J].Materials Science and Technology,2021,29(6):35-41.DOI:10.11951/j.issn.1005-0299.20210019. |
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| 具有高的热稳定性的红光荧光粉NaGdF4∶Eu3+的研究 |
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王春伟1,王亚雄1,梁洁1,李燕2,明俊宇1,黄映恒1,廖森3
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(1.广西大学 资源环境与材料学院,南宁 530004; 2.广西经正科技开发有限责任公司,南宁 530007;3.广西大学 化学化工学院,南宁 530004 )
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| 摘要: |
| 采用红光荧光粉制备的白光LED具有高显色指数和低色温的特点。为制备具有优秀性能的红光荧光粉,本文以氟化铵、硝酸铕、硝酸钆、硝酸钠以及聚乙二醇为原料,采用水热法制备了一系列具有发光负热猝灭特性的NaGdF4∶Eu3+的红光荧光粉,得到的最佳样品为NaGdF4∶0.25Eu3+,并对最佳样品进行了一系列表征。XRD结果表明,Eu3+成功掺入NaGdF4中；变温荧光表征测试结果表明,最佳样品的发光具有负的热猝灭效应。与室温相比,132 ℃时的积分发射强度提高了51.07%,即使温度升高至226 ℃,仍能够达到常温时的水平。良好的热稳定性拓展了红光荧光粉NaGdF4∶Eu3+在紫外激发白光LED的应用。对负的热猝灭现象进行了机理探讨,研究发现:由于部分热量被转换为光辐射的能量,导致负的热猝灭现象的出现；将此红光荧光粉与395 nm UV芯片封装测试,可以发现其在50 mA电流下仍能保持较低的色温,与变温荧光测试结果相互印证。优异的高温性能表明,NaGdF4∶0.25Eu3+红光荧光粉适合作为WLED中的红光成分,具有潜在应用价值。 |
| 关键词: 红光荧光粉 负热猝灭 能量转换 水热合成 稀土发光材料 |
| DOI：10.11951/j.issn.1005-0299.20210019 |
| 分类号:O614 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(21661006,21965004). |
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| Study on the high thermal stability of red emitting phosphor NaGdF4∶Eu3+ |
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WANG Chunwei1, WANG Yaxiong1, LIANG Jie1, LI Yan2, MING Junyu1, HUANG Yingheng1, LIAO Sen3
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(1. School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; 2. Guangxi Jingzheng Science and Technology Development Co.Ltd., Nanning 530007, China;3.Collegeof Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China)
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| Abstract: |
| White LED prepared by red phosphors has high color rendering index and low color temperature. In order to prepare red phosphors with excellent properties, ammonium fluoride, europium nitrate, gadolinium nitrate, sodium nitrate, and polyethylene glycol were used as raw materials, and a series of NaGdF4∶Eu3+ red emitting phosphors with luminescent negative thermal quenching effect were prepared by hydrothermal method.The optimal sample was NaGdF4∶0.25Eu3+and the samples were characterized by a series of tests.XRD results show that Eu3+ was successfully incorporated into NaGdF4. Results of variable temperature fluorescence characterization test show that the luminescence of the optimal sample had a negative thermal quenching effect. Compared with room temperature, the integral emission intensity at 132 ℃ was increased by 51.07%, and even when the temperature increased to 226 ℃,it could still reach the initial strength at room temperature.The good thermal stability can expand the application of NaGdF4∶Eu3+red emitting phosphor in UV-excited white LEDs. The mechanism of the negative thermal quenching effect was discussed, and results show that some heat was converted into the radiation energy of light, which caused the negative thermal quenching effect.The red phosphor was packaged and tested with 395 nm UV chip, and it was found that it could still maintain a low color temperature at the current of 50 mA, which was consistent with the results of variable temperature fluorescence test. The excellent high temperature performance indicates that NaGdF4∶0.25Eu3+ red phosphor is suitable for red light component in WLED, and has potential application value. |
| Key words: red emitting phosphor negative thermal quenching energy transformation hydrothermal method rare earth luminescent material |
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