A monolithic white laser
A monolithic white laser
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DOI：
10.1038/nnano.2015.149
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发表时间：
2015-09-01
影响因子：
38.3
通讯作者：
Ning, C. Z.
中科院分区：
文献类型：
--
作者：
Fan, Fan;Turkdogan, Sunay;Ning, C. Z.
单片半导体激光器能够发射整个可见光谱，具有广泛的重要应用，如固态照明，全色显示，可见彩色通信和多色荧光传感。这种光源的最终形式将是单片白色激光器。然而，实现这样的器件一直是具有挑战性的，因为在实现不同颜色发射所需的失配材料的外延生长方面存在固有的困难。在这里，我们展示了单片多段半导体纳米片的基础上的四元合金的ZnCdSSe，同时在红色，绿色和蓝色激光。这是可能的，通过一种新的纳米材料生长策略，使单独控制的组成，形态和带隙的片段。我们的纳米激光器可以动态调整，在整个可见光范围内发射，比最常用的光源覆盖70%以上的可感知颜色。
Monolithic semiconductor lasers capable of emitting over the full visible-colour spectrum have a wide range of important applications, such as solid-state lighting, full-colour displays, visible colour communications and multi-colour fluorescence sensing. The ultimate form of such a light source would be a monolithic white laser. However, realizing such a device has been challenging because of intrinsic difficulties in achieving epitaxial growth of the mismatched materials required for different colour emission. Here, we demonstrate a monolithic multi-segment semiconductor nanosheet based on a quaternary alloy of ZnCdSSe that simultaneously lases in the red, green and blue. This is made possible by a novel nanomaterial growth strategy that enables separate control of the composition, morphology and therefore bandgaps of the segments. Our nanolaser can be dynamically tuned to emit over the full visible-colour range, covering 70% more perceptible colours than the most commonly used illuminants.