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This paper demonstrates experimentally and numerically that a significant modification of spontaneous emission rate can be achieved near the surface of a three-dimensional photonic crystal. In experiments, semiconductor core-shell quantum dots are intentionally confined in a thin polymer film on which a three-dimensional colloidal photonic crystal is fabricated. The spontaneous emission rate of quantum dots is characterised by conventional and time-resolved photoluminescence (PL) measurements. The modification of the spontaneous emission rate, which is reflected in the change of spectral shape and PL lifetime, is clearly observed. While an obvious increase in the PL lifetime is found at most wavelengths in the band gap, a significant reduction in the PL lifetime by one order of magnitude is observed at the short-wavelength band edge. Numerical simulation reveals a periodic modulation of spontaneous emission rate with decreasing modulation strength when an emitter is moved away from the surface of the photonic crystal. It is supported by the fact that the modification of spontaneous emission rate is not pronounced for quantum dots distributed in a thick polymer film where both enhancement and suppression are present simultaneously. This finding provides a simple and effective way for improving the performance of light emitting devices.  相似文献   
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城市土地供应制度分析   总被引:1,自引:0,他引:1  
资源配置方式的理论探析 城市土地供应方式的研究,其实质是资源配置的有效性问题.微观经济分析的一个基本结论是:竞争性均衡的配置是有效率的.正如亚当斯密指出的,市场机制就像一只"看不见的手",可以自动有效率地配置资源.实践证明,依靠市场机制的作用比采取其他方式更能提高资源配置的效率.  相似文献   
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