Concentration-Driven Selectivity of Energy Transfer Channels and Color Tunability in Ba3La(PO4)(3):Tb3+, Sm3+ for Warm White LEDs
Concentration-Driven Selectivity of Energy Transfer Channels and Color Tunability in Ba3La(PO4)(3):Tb3+, Sm3+ for Warm White LEDs
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用于暖白光 LED 的 Ba3La(PO4)(3):Tb3 、Sm3 中浓度驱动的能量传输通道选择性和颜色可调性
DOI：
10.1021/acs.inorgchem.7b00737
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发表时间：
2017
影响因子：
4.6
通讯作者：
Liang Hongbin
中科院分区：
文献类型：
--
作者：
Zhou Weijie;Gu Meng;Ou Yiyi;Zhang Caihua;Zhang Xuejie;Zhou Lei;Liang Hongbin
在此，我们在详细讨论从Tb3+到Sm3+的能量转移（ET）通道的浓度驱动选择性的基础上，报道了Ba3 La（PO 4）3：Tb3+，Sm3+（BLPO：TS）系统的大尺度发射颜色可调谐性。这是由于Tb3+的5D3和5D4发射呈浓度依赖性以及Tb3+与Sm3+通过5D3和5D4通道的不同作用机制所致。在稀Tb 3+的情况下，Sm 3+的红光发射主要通过5D3通道敏化，而在浓Tb 3+的情况下，5D4通道的贡献占主导地位。因此，通过简单地调节Tb 3+和Sm 3+的掺杂浓度，可以将磷光体的发射颜色从绿色调谐到红色。鉴于红色发光荧光粉对于暖白色发光二极管（WLED）至关重要，本系统开发了一种具有良好热稳定性和色度稳定性、内量子效率67%的橙红色Tb 3+、Sm 3+共激活荧光粉Ba3La0.90Tb0.05Sm0.05（PO 4）3（BLPO：5 T5 S）。然后，近紫外WLED（CCT为4500 K，Ra为81）制造使用该荧光粉。这些发现不仅表明橙红色荧光粉BLPO：5T5S可用于近紫外暖白色LED，而且还提供了对Tb 3+和Sm 3+激活的荧光粉的ET过程的新见解。
Here, we report the large-scale emission color tunability in Ba3La(PO4)3:Tb3+, Sm3+(BLPO:TS) system based on the detailed discussion on the concentration-driven selectivity of energy transfer (ET) channels from Tb3+to Sm3+. It is induced by the concentration-dependent5D3and5D4emissions of Tb3+and the different interaction mechanisms of ET from Tb3+to Sm3+via5D3and5D4channels. In the diluted Tb3+scenario, the red emission of Sm3+is efficiently sensitized via the5D3channel, while in the concentrated Tb3+case, the contribution of5D4channel is dominant. Therefore, by simply adjusting the doping concentrations of Tb3+and Sm3+, the emission color of the phosphors can be tuned from green to red. In view of the phosphors with red emissions are critical to the warm white light-emitting diodes (WLEDs), an orange-red Tb3+, Sm3+coactivated phosphor Ba3La0.90Tb0.05Sm0.05(PO4)3(BLPO:5T5S) with good thermal and chromaticity stability and internal quantum efficiency ∼67% is developed in the system. Then, a near-UV WLED (CCT ≈ 4500 K,Ra≈ 81) is fabricated using this phosphor. These findings not only indicate that the orange-red phosphor BLPO:5T5S is available for near-UV warm white LEDs but also deliver new insights into the ET processes in Tb3+and Sm3+activated phosphors.