Photoluminescence properties and preferable site occupancy of Ce3+ in apatite-like RbSr4(BO3)3 blue-emitting phosphors for white LEDs
Photoluminescence properties and preferable site occupancy of Ce3+ in apatite-like RbSr4(BO3)3 blue-emitting phosphors for white LEDs
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白光 LED 类磷灰石 RbSr4(BO3)(3) 蓝光荧光粉中 Ce3 的光致发光特性和优选位点占据
DOI：
10.1039/c7nj02178j
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发表时间：
2017-11-07
影响因子：
3.3
通讯作者：
Xia, Mingjun
中科院分区：
文献类型：
--
作者：
Jia, Zhen;Xia, Mingjun
采用高温固相反应方法合成了近紫外（n-UV）泵浦蓝光磷灰石类荧光粉RbSr4（BO3）（3）：Ce3+（RSBO：Ce3+）。 Rietveld 对结构的精修表明，尽管结构中存在一个 Rb+ 和三个不同的晶体 Sr2+ 离子，但 Ce3+ 离子易于占据 Sr1(2+) (8c) 位点。 Ce3+离子激活的RbSr4(BO3)(3) (RSBO)材料可以被320至365 nm范围内相对较宽的吸收带激发，这与商业n-UV白光发光二极管(w-LED)芯片的光非常匹配，并且由于Ce3+离子从5d到4f的电子跃迁而产生峰值在415 nm的强蓝色发射光谱。 RSBO:Ce3+的色纯度与商业蓝光荧光粉BAM:Eu2+的色纯度相当。随温度变化的光谱表明，其在100℃时的发光强度可以保持在室温下初始值的85%左右。通过将 RSBO: Ce3+、商用 (Sr, Ba)(2)SiO4:Eu2+ 和 (Ca, Sr)SiAlN3: Eu2+ 荧光粉与 365 nm n-UV 芯片相结合来制造 w-LED 器件。 w-LED 器件产生白光，其 CIE 色度坐标、相关色温 (CCT) 和显色指数 R-a 分别为 (x, y) = (0.3315, 0.3402)、5540 K 和 72.9。实验结果表明，RSBO:Ce3+荧光粉是一种很有前景的候选材料，可作为 w-LED 中的蓝色成分。
A near-ultraviolet (n-UV) pumped blue-emitting apatite-like phosphor RbSr4(BO3)(3):Ce3+ (RSBO: Ce3+) was synthesized using a high temperature solid-state reaction method. Rietveld refinement on the structure indicates that Ce3+ ions are apt to occupy the Sr1(2+) (8c) site, in spite of one Rb+ and three different crystallographic Sr2+ ions in the structure. The Ce3+ ion activated RbSr4(BO3)(3) (RSBO) material can be excited by a relatively broad absorption band ranging from 320 to 365 nm, which matches well with the light from the commercial n-UV white light emitting diode (w-LED) chips, and generates a strong blue emission spectrum peaking at 415 nm due to the electronic transitions from 5d to 4f of the Ce3+ ion. And the color purity of RSBO: Ce3+ is comparable to that of the blue-emitting commercial phosphor BAM: Eu2+. The temperature-dependent spectra show that its luminescence intensity at 100 degrees C can remain about 85% of the initial value at room temperature. A w-LED device was fabricated by combining the RSBO: Ce3+, commercial (Sr, Ba)(2)SiO4:Eu2+ and (Ca, Sr)SiAlN3: Eu2+ phosphors with a 365 nm n-UV chip. The w-LED device generates white light with CIE chromaticity coordinates, correlated color temperature (CCT) and color-rendering index R-a are (x, y) = (0.3315, 0.3402), 5540 K and 72.9, respectively. The experimental results indicate that the RSBO: Ce3+ phosphor is a promising candidate as a blue component for application in w-LEDs.