Modification of the spontaneous emission of quantum dots near the surface of a three-dimensional colloidal photonic crystal |
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| Authors: | Liu Zheng-Qi Feng Tian-Hu Dai Qiao-Feng Wu Li-Jun Lan Sheng Ding Cai-Rong Wang He-Zhou and Gopal Achanta Venu |
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| Institution: | Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China;Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China;Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China;Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China;Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China;State Key Laboratory of Optoelectronic Materials and Technologies, Zhongshan (Sun Yat-Se14) University, Guangzhou 510275, China;State Key Laboratory of Optoelectronic Materials and Technologies, Zhongshan (Sun Yat-Se14) University, Guangzhou 510275, China;Department of Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research, Homi Bhabha Road,Mumbai 400005, India |
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| Abstract: | 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. |
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| Keywords: | spontaneous emission colloidal photonic crystal semiconductor quantum dot time-resolved photoluminescence |
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