CdSe/ZnS量子点下转换膜的红、绿、蓝顶发射有机发光器件

顶发射结构可实现100%的开口率, 对高品质有机发光器件(OLED)显示具有重要意义。但目前OLED显示的传统制作方法难度较大, 且器件的光谱稳定性较差。为了降低OLED显示的制作难度并进一步提高器件的光谱稳定性, 本文将CdSe/ZnS量子点与聚甲基丙烯酸甲酯溶液相混合, 并通过压印法制备了具有微结构阵列的红光与绿光量子点下转换膜, 将其与高效顶发射蓝光OLED和彩色滤光片相结合, 实现了红(R)、绿(G)、蓝(B)三色顶发射OLED。RGB器件的最大电流效率分别为36、219和106 cd/A, 色坐标分别为(070, 030)、(024, 062)和(010, 020)。此外, 器件的光谱与色坐标几乎不随电压变化, 且同时具有优良的光谱角度稳定性。这种实现OLED彩色化的方法具有制作简单、成本较低等优点, 具有广阔的发展前景。

Abstract

Top-emitting devices have the potential to achieve high aperture ratio of 100%, and thus it is very important for high-quality OLED displays. However, traditional fabrication methods used for achieving red, green and blue(RGB) OLED display are complicated and difficult, and spectral stability of such RGB OLEDs is always poor as time goes on. In this paper, to achieve color-stable RGB OLEDs, red and green quantum dots down-conversion films with microstructure are prepared by integrating CdSe/ZnS quantum dots into polymethyl methacrylate and using transfer imprint process, and then they are combined with efficient top-emitting blue OLED and color filters to achieve RGB emission using the same organic functional layers. RGB OLEDs exhibit a maximum current efficiency of 36, 219 and 106 cd/A, respectively, and their chromaticity coordinates are (070,030), (024,062) and (010,020), respectively. Spectra and chromaticity coordinates of RGB OLEDs are almost invariable under different voltages, and emission of such RGB OLEDs also show excellent angle stability. This method used for realizing full-color OLED has the advantages of simple fabrication technique and low cost, and thus has broad development prospects.

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尹茂军, 潘腾, 刘士浩, 谢文法, 张乐天. CdSe/ZnS量子点下转换膜的红、绿、蓝顶发射有机发光器件[J]. 中国光学, 2019, 12(6): 1431. YIN Mao-jun, PAN Teng, LIU Shi-hao, XIE Wen-fa, ZHANG Le-tian. Top-emitting red, green and blue organic light-emitting devices with CdSe/ZnS quantum dots down-conversion films[J]. Chinese Optics, 2019, 12(6): 1431.

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