Novel Yellow-Emitting Sr8MgLn(PO4)7:Eu2+ (Ln = Y, La) Phosphors for Applications in White LEDs with Excellent Color Rendering Index
Novel Yellow-Emitting Sr8MgLn(PO4)7:Eu2+ (Ln = Y, La) Phosphors for Applications in White LEDs with Excellent Color Rendering Index
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DOI：
10.1021/ic200515w
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发表时间：
2011-06-20
影响因子：
4.6
通讯作者：
Chen, Teng-Ming
中科院分区：
文献类型：
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作者：
Huang, Chien-Hao;Chen, Teng-Ming
通过固相反应成功合成了Eu2+激活的Sr8MgY(PO4)(7)和Sr8MgLa(PO4)(7)黄光荧光粉，用于优异显色指数的白光发光二极管(LED)。这些荧光粉的激发和反射光谱在250-450 nm近紫外区域显示宽带激发和吸收，这归因于Eu2+的4f(7) -> 4f(6)5d(1)跃迁。因此，这些荧光粉满足近紫外LED芯片的应用要求。在 400 nm 激发时，Sr8MgY(PO4)(7):Eu2+ 和 Sr8MgLa(PO4)(7): Eu2+ 荧光粉表现出以 518、610 和 611 nm 为中心的强黄色发射，并且比 (Ba,Sr)(2)SiO4 (570 nm) 商品荧光粉具有更好的热稳定性。 Sr8MgLa(PO4)(7):Eu2+和Sr8MgY(PO4)(7):Eu2+荧光粉中Eu2+的组成优化浓度分别确定为0.01和0.03 mol。使用近紫外 400 nm 芯片制造了暖白光近紫外 LED，该芯片由蓝光发射 BaMgAl10O17:Eu2+ 和黄光发射 Sr8MgY(PO4)(7):0.01Eu(2+) 或 Sr8MgLa(PO4)(7):0.03Eu(2+) 的荧光粉混合物泵浦，由 350 mA 电流驱动。含有 LED 的 Sr8MgY(PO4)(7):0.01Eu(2+) 和 Sr8MgLa(PO4)(7):0.03Eu(2+) 产生白光，国际照明委员会 (CIE) 色度坐标为 (0.348, 0.357) 和 (0.365, 0.328)，暖相关色温为 4705 和4100 K，出色的显色指数分别为 95.375 和 91.75。
Eu2+-activated Sr8MgY(PO4)(7) and Sr8MgLa(PO4)(7) yellow-emitting phosphors were successfully synthesized by solid-state reactions for applications in excellent color rendering index white light-emitting diodes (LEDs). The excitation and reflectance spectra of these phosphors show broad band excitation and absorption in the 250-450 nm near-ultraviolet region, which is ascribed to the 4f(7) -> 4f(6)5d(1) transitions of Eu2+. Therefore, these phosphors meet the application requirements for near-UV LED chips. Upon excitation at 400 nm, the Sr8MgY(PO4)(7):Eu2+ and Sr8MgLa(PO4)(7): Eu2+ phosphors exhibit strong yellow emissions centered at 518, 610, and 611 nm with better thermal stability than (Ba,Sr)(2)SiO4 (570 nm) commodity phosphors. The composition-optimized concentrations of Eu2+ in Sr8MgLa(PO4)(7):Eu2+ and Sr8MgY(PO4)(7):Eu2+ phosphors were determined to be 0.01 and 0.03 mol, respectively. A warm white-light near-UV LED was fabricated using a near-UV 400 nm chip pumped by a phosphor blend of blue-emitting emitting BaMgAl10O17:Eu2+ and yellow-emitting Sr8MgY(PO4)(7):0.01Eu(2+) or Sr8MgLa(PO4)(7):0.03Eu(2+), driven by a 350 mA current. The Sr8MgY(PO4)(7):0.01Eu(2+) and Sr8MgLa(PO4)(7):0.03Eu(2+) containing LEDs produced a white light with Commission International de I'Eclairage (CIE) chromaticity coordinates of (0.348, 0.357) and (0.365, 0.328), warm correlated color temperatures of 4705 and 4100 K, and excellent color rendering indices of 95.375 and 91.75, respectively.