Polarized white light from hybrid organic/III-nitrides grating structures.
Polarized white light from hybrid organic/III-nitrides grating structures.
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DOI：
10.1038/srep39677
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发表时间：
2017-01-03
影响因子：
4.6
通讯作者：
Wang T
中科院分区：
文献类型：
--
作者：
Athanasiou M;Smith RM;Ghataora S;Wang T
从有机/无机混合器件中获得了高度偏振的白色光发射。通过将蓝色InGaN基多量子威尔斯（MQW）与一维（1D）光栅结构和下转换F8 BT黄光发射聚合物相结合来制造混合器件。1D光栅结构将蓝色发射从非偏振转换为高度偏振;由于增强的纳米限制，已经从沿着光栅结构的周期性纳米通道沿着填充和对准的F8 BT聚合物实现了高度偏振的黄色发射。光学偏振测量表明，我们的设备演示了最小的纳米通道宽度的偏振度高达43%。此外，具有这种光栅结构的混合器件允许我们实现施主中偶极子之间的最佳相对取向（即，InGaN/GaN多量子阱）和受主中的偶极（即，F8 BT），使供体和受体之间的非辐射能量转移（NRET）的效率最大化。时间分辨的显微光致发光测量表明，NRET效率提高了2.5倍，最大NRET效率为90%。值得强调的是，开发的方法为制造高度偏振的白色光发射器铺平了道路。
Highly polarised white light emission from a hybrid organic/inorganic device has been achieved. The hybrid devices are fabricated by means of combining blue InGaN-based multiple quantum wells (MQWs) with a one-dimensional (1D) grating structure and down-conversion F8BT yellow light emitting polymer. The 1D grating structure converts the blue emission from unpolarised to highly polarised; Highly polarised yellow emission has been achieved from the F8BT polymer filled and aligned along the periodic nano-channels of the grating structure as a result of enhanced nano-confinement. Optical polarization measurements show that our device demonstrates a polarization degree of up to 43% for the smallest nano-channel width. Furthermore, the hybrid device with such a grating structure allows us to achieve an optimum relative orientation between the dipoles in the donor (i.e., InGaN/GaN MQWs) and the diploes in the acceptor (i.e., the F8BT), maximizing the efficiency of non-radiative energy transfer (NRET) between the donor and the acceptor. Time–resolved micro photoluminescence measurements show a 2.5 times enhancement in the NRET efficiency, giving a maximal NRET efficiency of 90%. It is worth highlighting that the approach developed paves the way for the fabrication of highly polarized white light emitters.
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