Efficient and Color Stable White Quantum-Dot Light-Emitting Diodes with External Quantum Efficiency Over 23%

Zhang, Heng; Su, Qiang; Sun, Yizhe; Chen, Shuming

2018-08-20

10.1002/adom.201800354

Advanced Optical Materials   影响因子和分区

2195-1071

White quantum dot light-emitting diodes (WQLEDs) with different structures are developed. By mixing red (R), blue (B) and green (G) quantum dots (QDs) together, the optimal WQLEDs exhibit a peak current efficiency (CE) of 22.54 cd/A and an external quantum efficiency (EQE) of 7.07%. The relatively poor performance is due to the efficient nonradiative Forster resonant energy transfer (FRET) among B-, G- and R-QDs. To address this issue, tandem WQLEDs are developed. By stacking the blue and the yellow QLEDs, the two-unit tandem WQLEDs exhibit a peak CE of 30.3 cd/A and a maximum EQE of 15.2%. To further improve the color stability and the efficiency, the R/G/B three-unit tandem WQLEDs are developed, which exhibit an impressive CE of 55.06 cd/A, a high EQE of 23.88% and a high luminance of 65690 cd/m(2), which are the highest values ever reported. Moreover, the optimal tandem WQLED exhibits a high color stability, a pure white color with a 1931 Commission International de I'Eclairage (CIE) coordinate of (0.33, 0.34) and a color rendering index of 80. The demonstrated tandem WQLEDs, with high efficiency, pure white color, high color stability and high color-rendering, would be promising candidates for next generation solid-state lighting and full-color display.

light-emitting diodes quantum dots tandem structure white emission

SCI ; EI

英语

第一 ; 通讯

Shenzhen Peacock Plan[KQTD2015071710313656]

Materials Science ; Optics

Materials Science, Multidisciplinary ; Optics

WOS:000442207500016

WILEY-V C H VERLAG GMBH

20183405733137

Color ; Diodes ; Energy transfer ; Light emitting diodes ; Luminance ; Nanocrystals ; Organic light emitting diodes (OLED) ; Semiconductor quantum dots

Semiconductor Devices and Integrated Circuits:714.2 ; Light/Optics:741.1 ; Nanotechnology:761 ; Quantum Theory; Quantum Mechanics:931.4

Web of Science

Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

Zhang, Heng,Su, Qiang,Sun, Yizhe,et al. Efficient and Color Stable White Quantum-Dot Light-Emitting Diodes with External Quantum Efficiency Over 23%[J]. Advanced Optical Materials,2018,6(16).

Zhang, Heng,Su, Qiang,Sun, Yizhe,&Chen, Shuming.(2018).Efficient and Color Stable White Quantum-Dot Light-Emitting Diodes with External Quantum Efficiency Over 23%.Advanced Optical Materials,6(16).

Zhang, Heng,et al."Efficient and Color Stable White Quantum-Dot Light-Emitting Diodes with External Quantum Efficiency Over 23%".Advanced Optical Materials 6.16(2018).