Department of Materials Science and Engineering, National Tsing Hua University , No. 101, Section 2, Kuang-Fu Road, Hsinchu 300, Taiwan.
ACS Appl Mater Interfaces. 2017 Nov 22;9(46):40516-40522. doi: 10.1021/acsami.7b12805. Epub 2017 Nov 7.
In this work, a sequential vacuum deposition process of bright, highly crystalline, and smooth methylammonium lead bromide and phenethylammonium lead bromide perovskite thin films are investigated and the first vacuum-deposited organometallic halide perovskite light-emitting devices (PeLEDs) are demonstrated. Exceptionally low refractive indices and extinction coefficients in the emission wavelength range are obtained for these films, which contributed to a high light out-coupling efficiency of the PeLEDs. By utilizing these perovskite thin films as emission layers, the vacuum-deposited PeLEDs exhibit a very narrow saturated green electroluminescence at 531 nm, with a spectral full width at half-maximum bandwidth of 18.6 nm, a promising brightness of up to 6200 cd/m, a current efficiency of 1.3 cd/A, and an external quantum efficiency of 0.36%.
在这项工作中，我们研究了亮、高结晶度、光滑的甲脒铅溴和苯乙基铵铅溴钙钛矿薄膜的顺序真空沉积工艺，并首次展示了真空沉积的有机金属卤化物钙钛矿发光器件（PeLED）。这些薄膜在发射波长范围内具有极低的折射率和消光系数，这有助于提高 PeLED 的光取出效率。通过利用这些钙钛矿薄膜作为发射层，真空沉积的 PeLED 呈现出非常窄的饱和绿光电致发光，在 531nm 处的光谱全宽半最大值带宽为 18.6nm，亮度高达 6200cd/m²，电流效率为 1.3cd/A，外量子效率为 0.36%。
