Organometal halide perovskite nanoparticles and its application in light-emitting diodes

• Main Authors: Huai-Ren Tsai, 蔡懷仁
• Other Authors: Yu-Chiang Chao
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/b57t3k

碩士 === 中原大學 === 物理研究所 === 105 === Organometallic halide perovskite are inexpensive materials which can be fabricated using simple synthetic routes. These are currently worldwide sensational novel materials and a possible major focus of the development photovoltaic device in the near future. Organometallic halide perovskite optoelectronic elements have recently emerged as one of the most renowned, outstanding and inexpensive photoelectric technology. In addition, organometallic halide perovskites, such as hybrid organic-inorganic CH3NH3PbI3, are considered novel materials that have attracted great concern and substantial interest as active layers in solar cells with photoelectric conversion efficiencies reaching to great extent up to ~ 20%. These materials are verified to have significant impact applications in laser, optical sensor and electroluminescent device. In this paper, the research works focus on using comparably similar structures of CH3NH3PbI3 on perovskite material and eventually uses these to fabricate light-emitting diodes. These experimental sections are well explained to the chapters in research and discussion. Herein, we developed a reprecipitation strategy to fabricate bright quantum dots. We reported a method to fabricate highly luminescent perovskite-based colloidal quantum dots. Color-tunable colloidal nanoparticles CH3NH3Pb (BrxI1-X) 3 and CH(NH2)2Pb(BrxI1-X)3 were synthesized in a short period of time. Through compositional modulations, the energy band-gaps and thus emission spectrum are tunable in 500 -700 nm. We used X-ray diffraction, electronic microscopy (SEM, TEM), carrier lifetime measurement device, photo-luminescence and absorption to verify the identity of the CH3NH3PbI3 nanoparticles. Furthermore, we used quantum dots with optical properties of photoluminescence ranging between 500 nm – 700 nm to fabricated light-emitting diodes. We used the nanoparticles with photoluminescence centered at 540 nm. To successfully prepare the light-emitting layer which is composed of both polymer and nanoparticles, the thin film was initially spin-coated and used as the light-emitting diode. To measure the parameters of light-emitting diode, the electrical excitation spectra measurement system was performed. The data gathered from the experimantal results effectively confirmed that we have indeed successfully fabricated the green light-emitting diodes. In addition, we productively used nanoparticles that are mixed with the polymer materials. The highly effective incorporation of nanopaticles with polymer materials to fabricate white light-emitting diodes was carried out successfully. This study is considered the first research to exploit the useful features of combined polymer and nano-particles of light-emitting body of white light light-emitting diodes.