Highly efficient, all-solution-processed, flexible white quantum dot light-emitting diodes

Abstract

Flexible information displays hold great promise for future optoelectronic applications. Herein, we report the fabrication of an efficient flexible white quantum dot (QD) light-emitting diode (QLED) with mixed red, green and blue QDs as emitters via an all-solution process. The resulting flexible QLED with a pure white emission shows high current efficiency of 10.5 cd A−1.

Solid‐State Thin‐Film Broadband Short‐Wave Infrared Light Emitters

“…In doing so, we first considered the possibility of mixing all sizes of emitter dots in the matrix ( Figure a), following prior art on white light emission CQD LEDs. [ 25–27 ] By mixing all three emitter QDs (λ ex = 1.3, 1.4, 1.5 µm, respectively) in the matrix QD of λ ex = 0.7 µm the resultant emission spectrum, shown in Figure 2c, failed to deliver broadband emission. The EL spectrum showed instead a strong peak around 1.5 µm.…”

Improvement in hole transporting ability and device performance of quantum dot light emitting diodes

“…The comparison of the device performance of green QLEDs from the previous literature studies and our study is listed in Table 2. [4][5][6]10,20,24,25,27,29,30 It is seen that our optimized device IV comprising PEDOT:PSS + BYK-P105 as the HTL and PEIE-modied ZnO as the ETL showed a very high brightness and comparable current efficiency compared with other studies. Therefore, blending BYK-P105 with PEDOT:PSS provides a successful approach to improve the performance of QLEDs.…”

Emergence of Impurity-Doped Nanocrystal Light-Emitting Diodes

“…Here, the materials of zero-dimensional (0D) CQDs and 2D CQWs are formed by IV elemental nanocrystal semiconductors (e.g., Si, Ge), the common groups being II-VI (e.g., CdSe, CdTe), III-V (e.g., InP, InAs), and IV-VI (e.g., PbSe, PbS), binary nanocrystal semiconductors, and nanocrystal semiconducting materials of ternary chalcogenide compounds AB m C n (A= Cu, Ag, Zn, Cd, etc. ; B= Al, Ga, In; C= S, Se, Te) [ 7 , 8 , 9 , 10 , 11 ]. Perovskites here refer to the materials possessing the formula ABX 3 , in which A-site is MA + , [CH(NH 2 ) 2 ] + (FA + ) or Cs + , B-site is mostly Pb 2+ , and X-site is Cl, Br, I or mixed halide systems (Cl/Br, Br/I) [ 24 , 25 , 26 , 27 , 28 ].…”

“…In 1994, Alivisatos et al reported the first nanocrystal LED by using CdSe colloidal quantum dots (CQDs), achieving a maximum external quantum efficiency (EQE) of 0.01% [ 6 ]. Since then, plenty of endeavors have been taken to enhance the performance (e.g., EQE, current efficiency (CE), power efficiency (PE), voltage, luminance, and stability) of CQD-LEDs [ 7 , 8 , 9 , 10 , 11 ]. Nowadays, the performance of CQD-LEDs can be comparable to or even better than that of state-of-the-art organic LEDs (OLEDs) [ 12 , 13 , 14 , 15 , 16 ].…”