Bluish-green-to-green thermally activated delayed fluorescent emitters based on β-diketone derivatives exhibiting a horizontal emission dipole orientation ratio of 88% and an external quantum efficiency of nearly 25%

Abstract

A series of β-diketone-based TADF emitters named MCzX derivatives are designed and prepared. Among these emitters, MCzDBM exhibits a PLQY of 79%, horizontal emission dipole orientation ratio of 88%, and high EQE of approximately 25%.

Molecular Engineering Modulating the Singlet–Triplet Energy Splitting of Indolocarbazole-Based TADF Emitters Exhibiting AIE Properties for Nondoped Blue OLEDs with EQE of Nearly 20%

“…This result also confirms the feasibility of regulating the Δ E ST through modulation of the differences in electron-donating and electron-withdrawing abilities. A possible reason is that regulating the difference can change the electron distribution and density within the molecule. , In addition, the use of π-extended donors may influence the locally excited state of T n , bringing it closer to the S 1 state . It can also be observed that a larger difference in electron-donating and -withdrawing abilities leads to a smaller Δ E ST (Table ).…”

Ubiquitous Aluminum(III)‐TADF Complex as Sensitizer for Highly Efficient Solution‐Processed Hyperfluorescent OLEDs with Narrow Emission

“…In this molecular design, we expected i) suppressed 𝜋−𝜋 stacking interactions due to the steric bulkiness of four methyl groups on the carbazole units and ii) the TADF property induced by the twisted structure between MCz as an electron donor and dibenzoylmethanate (DBM) as an electron acceptor. The corresponding 𝛽-diketone ligand MCzDBM [33] exhibited far higher solubility in ordinary solvents than DMACPDO, [34] along with efficient TADF, realizing an EQE of 24.6% in an evaporationbased OLED. Thus, the corresponding Al(MCzDBM) 3 was expected to have far higher solubility than Al(DMACPDO) 3 , as well as efficient TADF.…”

AIE‐ESIPT Photoluminescent Probe Based on 3‐(3‐Hydroxypyridin‐2‐yl)isoquinolin‐4‐ol for the Detection of Intracellular Hydrogen Peroxide

“…Extensive research in excited-state intramolecular proton transfer (ESIPT) has revealed its essential role in various applications such as luminescent materials, [1] organic light-emitting diodes, [2,3] bioimaging probes, [4,5] photoswitches, [6,7] and molecular logic gates. [8,9] ESIPT molecules typically exist in two tautomeric forms: enol (E) and keto (K).…”