在過去研究中，我們實驗室成功地提升了鈣鈦礦發光二極體的效率以及亮度，但此僅只侷限於 CH3NH3PbBr3綠光波段，相較於傳統有機發光二極體，在紅光和藍光的部分 仍有很大的進步空間，且由於鈣鈦礦本身嚴重的離子遷移現象，更使得綠光以外的元件發展不易。
本實驗研究在以離子置換的方式製作混鹵素鈣鈦礦發光二極體，嘗試以此方式製作不同光譜的發光二極體，並觀察離子置換後薄膜的變化並利用量測分析確認離子是否成功進行置換 ，做成元件後再與傳統混鹵素元件做比較。最後再摻雜離子添加劑氯化膽鹼 (Choline Chloride)，嘗試改善薄膜缺陷和提升元件亮度和發光效率 ，並觀察離子遷移現象是否被抑制 。

In the past research, our laboratory successfully improved the efficiency and brightness of the perovskite light-emitting diodes (LEDs), but this is only limited to the CH3NH3PbBr3 in green light wavelength. Compared to the traditional organic light-emitting diodes, there is still a lot of room for improvement in red and blue light wavelength, and due to the serious ion migration phenomenon of perovskite itself, the development of red and blue light device is not easy.
In this experiment, the mixed halide perovskite light-emitting diode was fabricated by ion exchanged process. In this way, light-emitting diodes with different spectra were fabricated, and changes in the film after ion exchange were observed. Finally, the ion additive choline chloride was doped to try to improve the film defects and enhance the brightness and luminous efficiency of the device, and to observe whether the ion migration phenomenon was suppressed.

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