Highly efficient red fluorescent OLEDs based on diphenylacridine-naphthothiadiazole derivatives with upper level intersystem crossing

Highly Efficient Blue Organic Light-Emitting Diode Based on a Pyrene[4,5- d ]Imidazole-Pyrene Molecule

“…High-energy HLCT states T 3 and T 4 and small energy splitting between S 1 and T 3 or T 4 (ΔE ST = 0.09 and 0.08 eV, respectively) were observed, which might facilitate the reverse intersystem crossing (RISC) process and procure a high fluorescence radiation and EUE ratio in OLEDs. [41][42][43][44][45][46][47][48][49][50][51][52] Furthermore, it has been proved that introducing a π-conjugated phenyl ring unit between the D and A serves as an appropriate method for the effective modulation of HLCT excited state. 36…”

“…In recent years, materials with hybrid local and CT (HLCT) excited state were also well developed, which successfully achieved the merits of high η PL and a high output of singlet excitons in a series of donor (D)-acceptor (A) materials. 36,[41][42][43][44][45][46][47][48][49][50][51][52] HLCT materials also show the potential to maintain stable η ext at high brightness. Thus, there is still room for further enhancement of the η ext of blue OLEDs and low efficiency roll-offs in pyrene-based D-A system.…”

A highly efficient violet-blue OLED with Rec.2020 CIEy based on an orthogonal phenanthroimidazole-substituted 1,2,4-triazole derivative

“…5), which can promote the RISC process (T 5 → S 1 ) via a hot exciton channel. 4,24,31,33 As a consequence, we conjectured that the high EUE here was attributed to the HLCT mechanism and the horizontal orientation. However, in consideration of the similar electronic configurations of T 5 and S 1 , the hRISC rate should be insufficient, making the EQEs below 7%.…”

Achieving High Efficiency at High Luminance in Fluorescent Organic Light‐Emitting Diodes through Triplet–Triplet Fusion Based on Phenanthroimidazole‐Benzothiadiazole Derivatives

“…In Table S3, we compared the device performance of PIBzP, PIBzPCN, and PIBzTPA with that of traditional fluorescent, TADF and phosphorescent materials with emission from green to red. The EQE max of PIBzP‐, PIBzPCN‐, and PIBzTPA‐based doped devices is much higher than many traditional fluorescent OLEDs [35,37,43–46] . When compared to TADF devices, although the overall device performance of PIBzP‐, PIBzPCN‐, and PIBzTPA‐based doped devices is inferior to some state of art TADF devices, [47–49] the efficiency roll‐off of PIBzP‐, PIBzPCN‐, and PIBzTPA‐based doped devices is much smaller than that of many TADF devices, [50–56] and the EQE of PIBzP‐, PIBzPCN‐, and PIBzTPA‐based doped devices at the luminance of 1000 cd m −2 is even higher than that of some TADF devices [10,36,50–54] …”