Luminescence, energy transfer and thermal stability of LiBaB9O15:Sm3+, Eu3+ for white LEDs

Luminescence, energy transfer and thermal stability of LiBaB9O15:Sm3+, Eu3+ for white LEDs
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白光 LED 的 LiBaB9O15:Sm3 、 Eu3 的发光、能量传输和热稳定性

DOI:
10.1016/j.materresbull.2015.06.006
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发表时间:
2015-10
影响因子:
5.4
通讯作者:
Feng Teng
Feng Teng
中科院分区:
材料科学2区
文献类型:
--
作者:
Qinglin Guo;Zhiping Yang;Xu Li;Feng Teng

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用高温固相法合成了一系列Sm3+、Eu3+和Sm3+/Eu3+掺杂的LiBaB9O15。LiBaB_9O_(15):Eu~(3+)能产生红光(λex=1,395 nm),峰位于616 nm,属于Eu~(3+)的5D0→~7F~2跃迁。LiBaB_9O_(15):Sm~(3+)能产生橙红色发射(λex=1,395 nm),峰位于599 nm,归属于Sm~(3+)的4G5/2→_6H_7/2跃迁。Sm3+的衰减时间证实了LiBaB9O15中Sm3+向Eu3+的能量转移。当温度为150℃时,LiBaB_9O_(15):0.05Sm~(3+),0.1Eu~(3+)中Eu~(3+)的发射强度降低到室温下初始强度的76%,激活能为0.268 eV,证明了LiBaB_9O_(15):Sm~(3+),Eu~(3+)具有良好的热稳定性。LiBaB9O15:Sm3+,Eu3+的发光强度可以通过调节Eu3+的含量来调节,而LiBaB9O15:Sm3+,Eu3+的CIE色度坐标位于红色区域。
A series of Sm3+, Eu3+, and Sm3+/Eu3+doped LiBaB9O15are synthesized by a high temperature solid-state method. LiBaB9O15:Eu3+can produce red emission (λex= 395 nm), and the peak locates at 616 nm, which is attributed to5D0→7F2transition of Eu3+. LiBaB9O15:Sm3+can create orange–red emission (λex= 395 nm), and the peak locates at 599 nm, which is assigned to4G5/2→6H7/2transition of Sm3+. The energy transfer from Sm3+to Eu3+in LiBaB9O15is confirmed by decay times of Sm3+. When the temperature is 150 °C, the emission intensity of Eu3+in LiBaB9O15:0.05Sm3+, 0.1Eu3+is decreased to 76% of the initial intensity at room temperature, and the activation energy is calculated to be 0.268 eV, which prove good thermal stability of LiBaB9O15:Sm3+, Eu3+. The emission intensity of LiBaB9O15:Sm3+, Eu3+can be tuned by tuning Eu3+content, and Commission International de I’Eclairage (CIE) chromaticity coordinates of LiBaB9O15:Sm3+, Eu3+are located in the red region.
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