However, the introduction of CFs significantly reduces the brightness for more than 2/3 of the white light is absorbed by the CFs. The “white+CF” scheme has been proven to be an effective strategy for manufacturing large-area OLED televisions and high-resolution OLED microdisplays 26, 27, 28, 29. Instead of patterning the EMLs directly, the R/G/B side-by-side color pixels can also be realized by combining the white devices with the patterned color filters (CF) 26, 27. However, promoting the marriage between QLEDs and OLEDs could be difficult, since they come from different families.Īnother reason is that the inkjet printing, which is used to deposit and pattern the light-emitting layers (EMLs), has many shortcomings such as low resolution, poor uniformity, and is far from mature for mass-producing QLED displays 22, 23, 24, 25. By substituting the B-QLEDs with B-OLEDs, a hybrid display could be realized, which can enjoy both the high saturation of QLEDs as well as the high stability of OLEDs. While the stability of B-QLEDs is being questioned, its organic cousins-the fluorescent organic light-emitting diodes (FL-OLEDs), are relatively stable and have been applied in displays for years. 3, 21), which lags far behind those of R- and G-QLEDs. One reason is that the B-QLEDs are unstable, with a short T 50 lifetime of ∼200 h at an initial brightness of 1000 cd m −2 (refs. Although the efficiency of QLEDs could meet the requirements of display applications, the realization of QLED full-color display remains challenging. 3, 18) at an initial brightness of 1000 cd m −2. For instance, the EQEs of the state-of-the-art red- (R-), green- (G-), and blue- (B-) QLEDs are higher than 20.5% 1, 3, 13, 14, 22% 3, 15, 16, 17, 18, and 18% 14, 19, respectively, while the T 50 lifetime of R- and G-QLEDs are longer than 26,500 (refs. Recent advances have enabled QLEDs to exhibit high external quantum efficiency (EQE) and long operational lifetime. CdSe-based quantum-dot light-emitting diodes (QLEDs) have been extensively explored for applications in display and lighting due to their unique merits of high color saturation, tunable emission color, high brightness, and simple solution processability 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.
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