Recent progress on organic light-emitting diodes with phosphorescent ultrathin (<1nm) light-emitting layers

Combining intrinsic (blue) and exciplex (green and orange-red) emissions of the same material (OCT) in white organic light-emitting diodes to realize high color quality with a CRI of 97

“…An exciplex, originated from intermolecular charge-transfer excited-state emission, exhibits an intrinsically separated wave function, where the HOMO is located in the donor molecule and the LUMO is in the acceptor molecule. 26,27 This is a natural advantage for realizing TADF emission because of the possible smaller DE ST . 28,29 Exciplex emission is usually red-shifted compared to the individual emissions of donor and acceptor molecules due to its unique luminous mechanism with charge transfer from the deeper LUMO of the donor to the shallower HOMO of the acceptor, and the emission wavelength can be easily regulated by simply choosing suitable donor and acceptor materials.…”

Highly efficient solution-processed white organic light-emitting diodes based on a co-host system by controlling energy transfer among different emitters

“…To make clear the detailed EL mechanisms of these efficient WOLEDs, it is essential to investigate the energy-transfer processes between the three emitters and the two hosts. 36,37 As depicted in Fig. 8(a), the OLEDs with monochromic or mixed colors were fabricated and measured.…”

Novel carbazole- and dioxino[2,3-b]pyrazine-based bipolar hosts for red PhOLEDs with a high brightness

“…It is worth noting that the maximum brightness of R1 and R2 is 49 760 cd m −2 and 57 990 cd m −2 , respectively, and these values are observably higher than those for most reported red OLEDs in the literature. 32,33 Fig. 6(c) shows the current/power efficiency–brightness characteristics.…”

“…It is worth noting that the maximum brightness of R1 and R2 is 49 760 cd m À2 and 57 990 cd m À2 , respectively, and these values are observably higher than those for most reported red OLEDs in the literature. 32,33 ). Correspondingly, device R1 achieves a maximum EQE of 15.1%, which is also higher than that of R2 (12.8%).…”