ITO-Ag NW기반 투명 양자점 발광 다이오드

강태욱; 김효준; 정용석; 김종수; Taewook Kang; Hyojun Kim; Yongseok Jeong; Jongsu Kim

Korean Journal of Materials Research, Vol.30, No.8, 421-425, August, 2020

DOI10.3740/MRSK.2020.30.8.421 Export Citation

ITO-Ag NW기반 투명 양자점 발광 다이오드

ITO-Ag NW based Transparent Quantum Dot Light Emitting Diode

강태욱¹, 김효준², 정용석², 김종수^{1, 2, †}

¹부경대학교 LED 공학협동과정
²부경대학교 융합디스플레이공학과

Taewook Kang¹, Hyojun Kim², Yongseok Jeong², and Jongsu Kim^{1, 2, †}

¹Interdisciplinary Program of LED and Solid State Lighting Engineering, Pukyong National University, Busan 48513, Republic of Korea
²Department of Display Science and Engineering, Pukyong National University, Busan 48513, Republic of Korea

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A transparent quantum dot (QD)-based light-emitting diode (LED) with silver nanowire (Ag NW) and indium-tin oxide (ITO) hybrid electrode is demonstrated. The device consists of an Ag NW-ITO hybrid cathode (-), zinc oxide, poly (9-vinylcarbazole) (PVK), CdSe/CdZnS QD, tungsten trioxide, and ITO anode (+). The device shows pure green-color emission peaking at 548 nm, with a narrow spectral half width of 43 nm. Devices with hybrid cathodes show better performances, including higher luminance with higher current density, and lower threshold voltage of 5 V, compared with the reference device with a pure Ag NW cathode. It is worth noting that our transparent device with hybrid cathode exhibits a lifetime 9,300 seconds longer than that of a device with Ag NW cathode. This is the reason that the ITO overlayer can protect against oxidization of Ag NW, and the Ag NW underlayer can reduce the junction resistance and spread the current efficiently. The hybrid cathode for our transparent QD LED can applicable to other quantum structure-based optical devices.

Keywords:quantum dot;CdSe/CdZnS;light-emitting diode;silver nanowire;ITO electrode

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[1] Deshpande RS, Bulovic V, Forrest SR, Appl. Phys. Lett., 75, 888 (1999)

[2] Wendorff JH, Christ T, Gliisen B, Greiner A, Kettner A, Sander R, Stumpflen V, Tsukruk VV, Adv. Mater., 9, 49 (1997)

[3] Lu W, Kamiya I, Ichida M, Ando H, Appl. Phys. Lett., 95, 083102 (2009)

[4] Bera D, Qian L, Tseng TK, Holloway PH, Materials, 3, 2260 (2010)

[5] Yang Y, Zhang C, Qu X, Zhang W, Marus M, Xu B, Wang K, Sun XW, IEEE Trans. Nanotechnol., 18, 220 (2019)

[6] Chen Q, Yan Y, Wu X, Wang X, Zhang G, Chen J, Chen H, Guo T, J. Mater. Chem. C, 8, 1280 (2020)

[7] Chirvase D, Chiguvare Z, Knipper M, Parisi J, Dyakonov V, Hummelen JC, J. Appl. Phys., 93, 3376 (2003)

[8] Kim E, Xia YN, Whitesides GM, Nature, 376(6541), 581 (1995)

[9] Adamson AW, Gast AP, Physical Chemistry of Surfaces, 6th ed., Chap. 1, John Wiley & Son, New York (1997).

[10] Anikeeva PO, Halpert JE, Bawendi MG, Bulovic V, Nano Lett., 9, 2532 (2009)

[11] Ok KH, Kim JW, Park SR, Kim YM, Lee CJ, et al., Sci. Rep., 5, 9464 (2015)

[12] Kim SY, Lee JL, Kim KB, Tak YH, J. Appl. Phys., 95, 2560 (2004)

[13] Wu CC, Wu CI, Sturm JC, Kahn A, Appl. Phys. Lett., 70, 1378 (1997)