Interfacial engineering of graphene for highly efficient blue and white organic light-emitting devices.
Interfacial engineering of graphene for highly efficient blue and white organic light-emitting devices.
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用于高效蓝光和白光有机发光器件的石墨烯界面工程
DOI：
10.1038/s41598-018-26464-8
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发表时间：
2018-05-25
影响因子：
4.6
通讯作者：
Huang W
中科院分区：
文献类型：
--
作者：
Chen S;Zhang Q;Shang W;Liu L;Yu H;Zhang S;Deng L;Wang M;Wang M;Li X;Mi B;Huang W
石墨烯作为柔性有机发光器件（OLED）的阳极，虽然可以消除ITO的脆性特征，但存在功函数低、方块电阻高的固有缺点。化学掺杂作为一种常规方法被普遍用于降低石墨烯电极的薄层电阻和调节石墨烯电极的功函数，但由于化学物质的挥发性，其存在不稳定性问题。在此，首先将绝缘的聚（4-苯乙烯磺酸盐）（PSS）改性层沿着涂覆在石墨烯表面上，通过界面偶极子具有改善的空气稳定性和空穴注入能力。此外，PSS的使用有利于降低OLED的漏电流。然后在PSS改性的石墨烯上覆盖聚（3，4-乙撑二氧噻吩）：PSS（PEDOT：PSS）/三乙烯全氟-3，6-二氧杂-4-甲基-7-辛烯磺酸共聚物掺杂的PEDOT：PSS的梯度注入层，以进一步促进空穴注入并改善OLED内部的载流子平衡。通过上述界面改性技术，获得了非常高的蓝光和白色发射效率，分别为201.9 cd A−1（76.1 lm W−1，45.2%）和326.5 cd A−1（128.2 lm W−1，99.5%），这与迄今为止最高效的显示器和照明技术相当。
Graphene as anodes of flexible organic light-emitting devices (OLEDs) has intrinsic drawbacks of a low work function and a high sheet resistance although it can eliminate the brittle feature of ITO. Chemical doping as a conventional approach is universally used to decrease the sheet resistance and adjust the work function of graphene electrodes, but it suffers from instability problems due to the volatility of chemical species. Here, an insulated poly(4-styrenesulphonate) (PSS) modification layer is firstly coated on the graphene surface along with improved air-stability and hole-injection ability via interfacial dipoles. Besides, the utilization of PSS is beneficial to reduce the leakage current of OLEDs. Then a gradient injection layer of poly(3,4-ethylenedioxythiophene):PSS (PEDOT:PSS)/tetrafluoroethyleneperfluoro-3,6-dioxa-4-methyl-7-octenesulphonic acid copolymer-doped PEDOT:PSS is covered onto the PSS-modified graphene to further promote hole injection and improve carrier balance inside OLEDs. With above interfacial modification technique, very high efficiencies of 201.9 cd A−1(76.1 lm W−1, 45.2%) and 326.5 cd A−1(128.2 lm W−1, 99.5%) for blue and white emissions are obtained, which are comparable to the most efficient display and lighting technologies so far.
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影响因子：
4.6
作者：
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通讯作者：
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