基于分布反馈钙钛矿光波导的电泵浦放大自发辐射

Owing to the easy fabrication, low cost, easy control of band gap, easy large area deposition, organic-inorganic perovskite semiconductors hold great promise for a variety of applications in optoelectronic devices, including solar cell, light-emitting diose, thin film transistor. With the improvement in the quality of perovskite materials and their successful applications to the other optoelectronic devices, the application of perovskite in the laser has attracted much attention. The perovskite material has the advantages of high fluorescence quantum efficiency, large cross section of stimulated emission and tunable emission wavelength, which promise it as a kind of high gain media for solid-state laser devices. Perovskite laser has the advantages of simple fabrication, low cost and easy integration. It has great potential in the fields of communication, sensor, detection, spectrum and medical diagnosis as the cheap lasers. The aim of this proposal is to develop a approach to realize electrically pumped perovskite laser, in which grating is integrated to perovskite waveguide to fabricate a distributed feedback resonator. The DFB resonator will compress the spectral width and reduce the amplified spontaneous emission (ASE) threshold. Our work will be focused on following as, .(1)To clarify basic photophysics in perovskite waveguide under the presence of intense light and large injecting current..(2) To design and fabricate the waveguide with DFB resonator..(3) To investigate the electroluminescence and ASE of DFB waveguide driven by electric pulse at low temperature..(4) To optimize the techniques of fabrication and parameters of electroluminescent DFB waveguide.

钙钛矿半导体材料因其具有制备工艺简单、成本低、带隙容易调控、易大面积成膜，在太阳能电池有机、发光二极管、晶体管等光电子器件领域显示出很好的应用前景。随着钙钛矿半导体在不同光电器件的成功应用和材料本身性能的不断提高，其在激光应用也引起人们的关注。钙钛矿半导体材料具有荧光量子效率高、受激发射截面大、发光波长可调，是理想的激光增益介质材料。钙钛矿激光器具有制作简单、成本低廉、集成方便等优点，在通讯、传感器、探测、光谱和医疗诊断等方面有很大的应用潜力。本课题利用钙钛矿材料优异发光和电荷传输特性，将分布反馈（DFB）谐振腔和电致发光有机的结合，制备出具有反馈的电致发光钙钛矿波导，压缩光谱宽度，降低放大自发辐射（ASE）阈值，澄清钙钛矿半导体材料在高密度激发下的一些基本物理问题，优化器件材料和器件参数，实现电泵浦ASE。

钙钛矿半导体材料因其制备工艺简单、成本低、带隙容易调控、易大面积成膜，在太阳能电池有机、发光二极管、晶体管等光电子器件领域显示出很好的应用前景。随着 钙钛矿半导体在不同光电器件的成功应用和材料本身性能的不断提高，其在激光应用也引起人们的关注。钙钛矿半导体材料具有荧光量子效率高、受激发射截面大、发光波长可调，是理想的激光增益介质材料。钙钛矿材料可以通过印刷的方法，在柔性衬底上制备激光器、光放大器、光开关和光调制器，在未来大面积柔性器件领域有很好的应用前景。但是，目前钙钛矿电泵浦激光是一个世界难题，该项目根据研究计划从钙钛矿基本物性、电致发光、微纳晶体制备和放大自发辐射几个方面开展了研究。在钙钛矿材料表征、电致发光效率提高、钙钛矿微晶制备技术和形貌控制、钙钛矿波导和微晶放大自发辐射阈值降低等几个方面取得了一些研究成果。重要研究成果如下：发现在钙钛矿发光二极管激子离化主要发生在漏斗能量传递过程，完善其量子阱结构对提高大电流发光效率具有重要作用；发现钙钛矿薄膜的内部和界面缺陷对载流子的俘获和释放影响了器件的光电响应速度，影响了瞬间大电流的注入；利用底层和钙钛矿前驱液的浸润性的变化，对的制备的钙钛矿微（纳）米晶的几何尺度进行调控，得到几何尺度可控的高性能钙钛矿微晶；利用种子诱导和激光诱导实现了钙钛矿微晶的定点生长。在这些研究结果对深入研究和实现钙钛矿材料电泵浦放大自发辐射具有一定的意义。