Thermal stability of luminescence of NaCaPO4 : Eu2+ phosphor for white-light-emitting diodes
Thermal stability of luminescence of NaCaPO4 : Eu2+ phosphor for white-light-emitting diodes
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DOI：
10.1088/0022-3727/42/18/185105
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发表时间：
2009-09-21
影响因子：
3.4
通讯作者：
Seo, Hyo Jin
中科院分区：
文献类型：
--
作者：
Qin, Chuanxiang;Huang, Yanlin;Seo, Hyo Jin
通过常规固相反应合成了一种绿光荧光粉——Eu2+激活的NaCaPO4。研究了荧光粉的光致发光激发和发射光谱以及发光强度的温度依赖性。结果表明，NaCaPO4:Eu2+可以被280-420 nm的入射光有效激发，与近紫外LED芯片的发射波长匹配良好。 NaCaPO4：Eu2+具有较高的淬火温度。随着温度的升高，NaCaPO4:Eu2+的发射带出现异常蓝移，带宽变宽，发射强度降低。这种荧光粉在紫外芯片泵浦的白光发光二极管方面具有广阔的前景。讨论了这种单磷酸盐中 Eu2+ 离子的 CIE 坐标和发光衰减（寿命），以进一步研究潜在的应用。
A green-emitting phosphor, Eu2+-activated NaCaPO4, was synthesized by the conventional solid-state reaction. The photoluminescence excitation and emission spectra, and the temperature dependence of luminescence intensity of the phosphor were investigated. The results showed that NaCaPO4 : Eu2+ could be efficiently excited by incident light of 280-420 nm, which matched well with the emission wavelengths of near-UV LED chips. NaCaPO4 : Eu2+ has a higher quenching temperature. With an increase in the temperature, the emission bands of NaCaPO4 : Eu2+ show an abnormal blue-shift with broadening bandwidth and decreasing emission intensity. The phosphor has a promising potential for white-light-emitting diodes pumped by ultraviolet chips. The CIE coordinates and luminescence decay (lifetimes) of Eu2+ ions in this monophosphate were discussed in order to further investigate the potential applications.