Color-tunable QLED Based on Mixed Quantum Dots and Its White-light Application

被引：0
|
作者：
Que S.-H. [1 ]
Wei L.-M. [1 ]
Zhou X.-T. [1 ,2 ]
Zhang Y.-A. [1 ,2 ]
Wu C.-X. [1 ,2 ]
Guo T.-L. [1 ,2 ]
Yan Q. [1 ,2 ]
机构：
[1] College of Physics and Information Engineering, Fuzhou University, Fuzhou
[2] Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou
来源：
Faguang Xuebao/Chinese Journal of Luminescence | 2022年 / 43卷 / 04期
关键词：
Color tunable; Correlated color temperature; Quantum-dot light emitting diode; White-light application;
D O I：
10.37188/CJL.20210392
中图分类号：
学科分类号：
摘要：
A color tunable quantum-dot light emitting diode(QLED) with the structure of ITO/PEDOT: PSS/TFB/Mixed-QDs/ZnO/Ag was fabricated by using red and green mixed quantum dots as the light-emitting layer, and the electroluminescence spectrum of QLED device was studied. The experimental results show that the QLED device has significant color tunability. With the increase of applied voltage, the QLED device presents a color change from dark red to orange and then to dazzling yellow-green. The QLED device exhibits a turn-on voltage of 2.0 V and the maximum brightness can reach 6×104 cd/m2. What's more, the device achieves a maximum current efficiency of 21 cd/A and a maximum external quantum efficiency of 7.5% at 31 934 cd/m2. As an application demonstration, we further combine the color tunable QLED device with GaN-based blue LED to prepare a white light emission. The results show that the color temperature of white light emission can be tuned from 3 568 K(warm white) to 10 269 K(cold white) and color rendering index is not less than 70, exhibiting great prospects in the application of lighting. © 2022, Science Press. All right reserved.
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页码：591 / 597
页数：6
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共 27 条
  • [1] DAI X L, ZHANG Z X, JIN Y Z, Et al., Solution-processed, high-performance light-emitting diodes based on quantum dots, Nature, 515, 7525, pp. 96-99, (2014)
  • [2] SHEN H B, GAO Q, ZHANG Y B, Et al., Visible quantum dot light-emitting diodes with simultaneous high brightness and efficiency, Nat. Photonics, 13, 3, pp. 192-197, (2019)
  • [3] DAI X L, DENG Y Z, PENG X G, Et al., Quantum-dot light-emitting diodes for large-area displays: towards the dawn ofcommercialization, Adv. Mater, 29, 14, (2017)
  • [4] KIM S, LIM Y T, SOLTESZ E G, Et al., Near-infrared fluorescent type II quantum dots for sentinel lymph node mapping, Nat. Biotechnol, 22, 1, pp. 93-97, (2004)
  • [5] TANG J, KEMP K W, HOOGLAND S, Et al., Colloidal-quantum-dot photovoltaics using atomic-ligand passivation, Nat. Mater, 10, 10, pp. 765-771, (2011)
  • [6] HE L R, FEI M, CHEN J, Et al., Graphitic C<sub>3</sub>N<sub>4</sub> quantum dots for next-generation QLED displays, Mater. Today, 22, pp. 76-84, (2019)
  • [7] SUKHOVATKIN V, HINDS S, BRZOZOWSKI L, Et al., Colloidal quantum-dot photodetectors exploiting multiexciton generation, Science, 324, 5934, pp. 1542-1544, (2009)
  • [8] PARK S J, SONG S H, KIM S S, Et al., Charge modulation layer and wide-color tunability in a QD-LED with multiemission layers, Small, 17, 17, (2021)
  • [9] ZHAO Y, GAO X P, LU P, Et al., Quantum dot-based white LEDs and their applications of smart lighting, Chin. J. Liq. Cryst. Disp, 36, 1, pp. 187-202, (2021)
  • [10] CAO F, WANG H R, SHEN P Y, Et al., High-efficiency and stable quantum dot light-emitting diodes enabled by a solution-processed metal-doped nickel oxide hole injection interfacial layer, Adv. Funct. Mater, 27, 42, (2017)
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