GO-induced effective interconnection layer for all solution-processed tandem quantum dot light-emitting diodes

Abstract

Compared to conventional quantum dot light-emitting diodes, tandem quantum dot light-emitting diodes (TQLEDs) possess higher device efficiency and more applications in the field of flat panel display and solid-state lighting in the future. The TQLED is a multilayer structure device which connects two or more light-emitting units by using an interconnection layer (ICL), which plays an extremely important role in the TQLED. Therefore, realizing an effective ICL is the key to obtain high-efficiency TQLEDs. In this work, the p-type materials polys (3, 4-ethylenedioxythiophene), poly (styrenesulfonate) (PEDOT: PSS) and the n-type material zinc magnesium oxide (ZnMgO), were used, and an effective hybrid ICL, the PEDOT: PSS-GO/ZnMgO, was obtained by doping graphene oxide (GO) into PEDOT:PSS. The effect of GO additive on the ICL was systematically investigated. It exhibits that the GO additive brought the fine charge carrier generation and injection capacity simultaneously. Thus, the all solution-processed red TQLEDs were prepared and characterized for the first time. The maximum luminance of 40877 cd/m² and the highest current efficiency of 19.6 cd/A were achieved, respectively, showing a 21% growth and a 51% increase when compared with those of the reference device without GO. The encouraging results suggest that our investigation paves the way for efficient all solution-processed TQLEDs.

Keywords

tandem quantum dot light-emitting diodes / all solution-processed / interconnection layer / graphene oxide / current efficiency

References

[1] JiW, ShenH, ZhangH, KangZ, ZhangH. Over 800% efficiency enhancement of all-inorganic quantum-dot light emitting diodes with an ultrathinalumina passivating layer [J]. Nanoscale, 2018, 10: 11103-11109

[2] ChenL, LeeM H, WangY, SyedA A, ZhuF. Interface dipole for remarkable efficiency enhancement in all-solution-processable transparent inverted quantum dot light-emitting diodes [J]. Journal of Materials Chemistry C, 2018, 6: 2596

[3] DaiX, ZhangZ, JinY, NiuY, CaoX, ChenL, WangJ, PengX. Solution-processed, high-performance light-emitting diodes based on quantum dots [J]. Nature, 2014, 51596-99

[4] MashfordB S, StevensonM, PopvicZ, HamiltonC, ZhouZ, BreenC, SteckelJ, BulovicV, BawendiM, Coe-SullivanS, KazlasT P. High-efficiency quantum-dot light-emitting devices with enhanced charge injection [J]. Nature Photonics, 2013, 7: 407-412

[5] BaeW K, LimJ, LeeD, ParkM J, LeeH, KwakJ, CharK, LeeC, LeeS. R/G/B/Natural white light thin colloidal quantum dot-based light-emitting devices [J]. Advanced Materials, 2014, 26(37): 6387-6393

[6] YangY, ZhengY, CaoW, TitovA, HyvonenJ, MandersR J, XueJ, HollowayH P, QianL. High-efficiency light-emitting devices based on quantum dots with tailored nanostructures [J]. Nature Photonics, 2015, 9: 259-266

[7] RamasamyP, KimN, KangY S, RamiresO, LeeJ S. Tunable, bright, and narrow-band luminescence from colloidal indium phosphide quantum dots [J]. Chem Mater, 2017, 29(16): 6893-6899

[8] WangF, SunW, LiuP, WangZ, ZhangJ, WeiJ, LiY, HayatT, AlsaediA, TanZ. Achieving balanced charge injection of blue quantum dot light-emitting diodes through transport layer doping strategies [J]. Journal of Physical Chemistry Letters, 2019, 10(5): 960-965

[9] ZhaoY, ChenL, WuJ, TanX, XiongZ, LeiY. Composite hole transport layer consisting of high-mobility polymer and small molecule with deep-lying HOMO level for efficient quantum dot light-emitting diodes [J]. IEEE Electron Device Letters, 2020, 41(1): 80-83

[10] LiuY, JiangC, WangJ, MuL, HeZ, ZhongZ, CunY, MaiC, WangJ, PengJ, CaoY. Highly efficient all-solution processed inverted quantum dots based light-emitting diodes [J]. ACS Nano, 2018, 12(2): 1564-1570

[11] JiW, LvY, JingP, ZhangH, WangJ, ZhangH, ZhaoJ. Highly efficient and low turn-on voltage quantum dot light-emitting diodes by using a stepwise hole-transport layer [J]. ACS Appled Materials & Interfaces, 2015, 7: 15955-15960

[12] ZhangH, SunX, ChenS. Over 100 cd-A⁻¹ efficient quantum dot light-emitting diodes with inverted tandem structure [J]. Advnceo Functonal Materials, 2017, 27: 1700610

[13] JiangC, ZouJ, LiuY, SongC, HeZ, ZhongZ, WangJ, YipH L, PengJ, CaoY. Fully solution-processed tandem white quantum-dot light-emitting diode with an external quantum efficiency exceeding 25% [J]. ACS Nano, 2018, 12(6): 6040-6049

[14] ZhengH, FengY, ChenS. Improved efficiency and enhanced color quality of light-emitting diodes with quantum dot and organic hybrid tandem structure [J]. ACS Appled Materials & Interfaces, 2016, 8(40): 26982-26988

[15] ZhangH, ChenS, SunX. Efficient red/green/blue tandem quantum-dot light-emitting diodes with external quantum efficiency exceeding 21% [J]. ACS Nano, 2018, 12(1): 697-704

[16] ShenH, GaoQ, ZhangY, LinY, LinQ, LiZ, ChenL, ZengZ, LiX, JiaY, WangS, DuZ, LiL, ZhangZ. Visible quantum dot light-emitting diodes with simultaneous high brightness and efficiency [J]. Nature Photonics, 2019, 13192-197

[17] ChibaT, PuY J, KidoJ. Solution-processed white phosphorescent tandem organic light-emitting devices [J]. Advanced Materials, 2015, 27(32): 4681-4687

[18] KimJ H, HanC Y, LeeK H, AnK S, SongW, KimJ, OhM S, DoY R, YangH. Performance improvement of quantum dot-light-emitting diodes enabled by an alloyed ZnMgO nanoparticle electron transport layer [J]. Chemistry of Materials, 2015, 27(1): 197-204

[19] SchnieppH C, LiJ L, McallisterM J, SaiH, Herrera-AlonsoM, AdamsonD H, Prud’HommeR, CarR, SavilleD A, AksayL A. Functionalized single graphene sheets derived from splitting graphite oxide [J]. Journal of Physical Chemistry B, 2006, 110(17): 8535-8539

[20] ChenS, YuX, ZhangM, CaoJ, LiY, DingL, ShiG. A graphene oxide/oxygen deficient molybdenum oxide nanosheet bilayer as a hole transport layer for efficient polymer solar cells [J]. Journal of Materials Chemistry A, 2015, 3: 18380-18383

[21] BaeS, LeeJ U, ParkH, JunE H, JunJ W, JoW H. Enhanced performance of polymer solar cells with PSSA-g-PANI/Graphene oxide composite as hole transport layer [J]. Solar Energy Materials & Solar Cells, 2014, 130: 599-604

[22] GaoY, YipH L, HauS K, O’malleyK M. Anode modification of inverted polymer solar cells using graphene oxide [J]. Applied Physics Letters, 2010, 97(20): 203306

[23] ZhouY, LiangC, YuJ, JiangX. Adsorption properties of a novel 3D graphene/MgO composite for heavy metal ions [J]. Journal of Central South University, 2019, 264813-823

[24] YuanX, YueW, ZhangJ. Electrochemically exfoliated graphene as high-performance catalyst support to promote electrocatalytic oxidation of methanol on Pt catalysts [J]. Journal of Central South University, 2020, 27(9): 2515-2529

[25] SongD H, SongS H, ShenT Z, LeeJ S, ParkW H, KingS S, SongJ K. Quantum dot light-emitting diodes using a graphene oxide/PEDOT:PSS bilayer as hole injection layer [J]. Rsc Advances, 2017, 7(69): 43396-43402

[26] XiangQ, YuJ. JARONIEC M Graphene-based semiconductor photocatalysts [J]. Chemical Society Reviews, 2012, 41(2): 782-796

[27] ParkY, ChoiK S, KimS Y. Graphene oxide/PEDOT:PSS and reduced graphene oxide/PEDOT: PSS hole extraction layers in organic photovoltaic cells [J]. Physica Status Solidi, 2012, 209(7): 1363-1368

[28] WangY, WangH, XuJ, HeB, LiW, WangQ, YangS, ZouB. PEDOT: PSS modification by blending graphene oxide to improve the efficiency of organic solar cells [J]. Polymer Composites, 2018, 39(9): 3066-3072

[29] WuX, LianL, YangS, HeG. Highly conductive PEDOT: PSS and graphene oxide hybrid film with the dipping treatment by hydroiodic acid for organic light emitting diodes [J]. Journal of Materials Chemistry C, 2016, 4(36): 8528-8534

[30] ChenJ, PanJ, HuangQ, XuF, NathanA. Graphene oxide/PEDOT: PSS as injection layer for quantum dot light emitting diode [J]. Physica Status Solidi (A) Applications and Materials, 2015, 212(12): 2856-2861

[31] WuJ, ChenL, TanX, ZhangQ, LeiY. Large performance enhancement in all-solution-processed, full-color, inverted quantum dot light-emitting diodes by using graphene oxide-doped hole injection layer [J]. The Journal of Physical Chemistry C, 2020, 124: 11617-11624

[32] LeiY, ZhaoY, ZhangQ, XiongZ, ChenL. Highly efficient and bright red quantum dot light-emitting diodes with balanced charge injection [J]. Organic Electronics, 2020, 81105683