Highly efficient and color-stable hybrid warm white organic light-emitting diodes using a blue material with thermally activated delayed fluorescence

Highly efficient tandem full exciplex orange and warm white OLEDs based on thermally activated delayed fluorescence mechanism

“…In view of above disadvantages in fluorescent and phosphorescent OLEDs, thermally activated delay fluorescence (TADF) have been successfully applied to high efficient OLEDs with various organic emitters in recent years [5][6][7][8]. The research of white OLEDs based on the TADF has also been undergoing [9][10][11]. Particularly, the attainable 100% IQE of OLEDs based on TADF mechanism has received considerable attention.…”

“…TADF is characterized by small energy difference (DE (SÀT) ) between the singlet (S 1 ) and triplet (T 1 ) excited states, which result in an efficient http://dx.doi.org/10.1016/j.orgel.2014. 11.014 1566-1199/Ó 2014 Elsevier B.V. All rights reserved. reverse intersystem crossing (RISC).…”

Red phosphorescent organic light-emitting diodes based on a novel host material with thermally activated delayed fluorescent properties

“…On one hand, PHOLEDs are much more expensive than *Corresponding author (email: duanl@mail.tsinghua.edu.cn) fluorescent OLEDs due to the high cost of phosphors containing rare metals, such as iridium [17,18] and platinum [19] and the high dopant concentration of phosphors (5 wt%-20 wt%) required to achieve optimum device performance [20][21][22][23]; on the other hand, the efficiencies of PHOLEDs tend to decrease with the brightness increasing, which is called efficiency roll-off [24]. Efforts have been paid to solve these problems, such as replacing the high-cost phosphorescent emitters to pure organic ones [25][26][27][28][29][30][31][32], or decreasing the excitons' lifetime and broadening the recombination zone to reduce molecular aggregation [24,[33][34][35], however, the performance of these devices are not satisfactory enough.…”

Efficient hybrid white organic light-emitting diodes for application of triplet harvesting with simple structure

“…To overcome, device structure consists of an interlayer between the fluorescent and the phosphorescent layers reduced the triplet exciton loss [11,12]. However, the use of the interlayer will restrict the device efficiency [10].…”