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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Ba2Ca(PO4)2:Eu~(2+) emission-tunable phosphor for solidstate lighting: luminescent properties and application as white light emitting diodes
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Ba2Ca(PO4)2:Eu~(2+) emission-tunable phosphor for solidstate lighting: luminescent properties and application as white light emitting diodes

机译：用于固态照明的Ba2Ca（PO4）2：Eu〜（2+）发射可调磷光体：发光特性和作为白色发光二极管的应用

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摘要

An emission-tunable, Eu~(2+)-activated, Ba2Ca(PO4)2:Eu~(2+) phosphor was synthesized by a conventional solid-state reaction. X-ray powder diffraction (XRD) and FT-IR spectroscopic analysis confirmed the phase formation. Electron paramagnetic resonance (EPR) analysis indicated there are three different crystallographic Ba~(2+) sites, namely, Ba(1), Ba(2) and Ba(3), occupied by the Eu~(2+) ions. The excitation and emission spectra, concentration dependence of the emission intensity and decay curves of the phosphor were investigated. The results showed that with increasing Eu~(2+) concentration, the emission peak wavelength redshifted from 457 to 500 nm, and the color hue can be tuned from a greenish blue to a yellowish green. A white LED was fabricated using a near ultraviolet (n-UV) 410 nm chip pumped with a blend of phosphors consisting of greenish blue-emitting Ba_(1.97)7Ca(PO4)2:0.03Eu~(2+) and red-emitting Ca_(3.97)7(PO4)2O:0.07Eu~(2+). When the applied current was 350 mA, the white LED had Commission International de I'Eclairage color coordinates of (0.3249, 0.3421) at a white light (correlated color temperature = 6020 K) and an excellent color rendering index of 93.
机译：通过常规的固相反应合成了可调谐发射的Eu〜（2 +）-活化的Ba2Ca（PO4）2：Eu〜（2+）荧光粉。 X射线粉末衍射（XRD）和FT-IR光谱分析证实了相的形成。电子顺磁共振（EPR）分析表明，存在3个不同的晶体Ba〜（2+）位，即Eu〜（2+）离子占据的Ba（1），Ba（2）和Ba（3）。研究了荧光粉的激发和发射光谱，发射强度的浓度依赖性和衰减曲线。结果表明，随着Eu〜（2+）浓度的增加，发射峰波长从457nm红移到500nm，色相可以从绿色蓝色变为黄色绿色。使用近紫外（n-UV）410 nm芯片泵浦了白色LED，该芯片泵浦了由发绿光的蓝色Ba_（1.97）7Ca（PO4）2：0.03Eu〜（2+）和发红光的磷光体组成的混合物Ca_（3.97）7（PO4）2O：0.07Eu〜（2+）。当施加的电流为350 mA时，白色LED在白光（相关色温= 6020 K）下的国际照明委员会色坐标为（0.3249，0.3421），出色的显色指数为93。

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