Recent Progress in Sublimable Cationic Iridium(III) Complexes for Organic Light‐Emitting Diodes

Abstract

Sublimable cationic iridium(III) complexes consisting of light-emitting coordinated iridium(III) cations and nonluminous negative counter-ions, show excellent photophysical properties, superior electrochemical behaviors and high thermal stabilities, therefore have emerged as a new library of phosphorescent materials for various organic optoelectronic devices.Here we summarize and highlight the recent progress in sublimable cationic iridium(III) complexes, regarding the material design strategies, synthetic routes, photoluminescent characteristics in both solutions and neat films, together with the current utilization in organic lightemitting diodes based on the emissive material layers fabricated by vacuum evaporation deposition. Finally, we present a brief outlook thereon, indicating the great promise and brilliant application prospect of sublimable cationic iridium(III) complexes in future flat-panel display and solid-state lighting technology.

Schiff Base Zinc(II) Complexes as Promising Emitters for Blue Organic Light-Emitting Diodes

“…Despite the significant progress achieved since the first preparation of organic light-emitting diodes (OLEDs) by Tang and Burroughes, the lack of cheap and processable electro-luminophores still represents immediate needs. The poor assortment of materials for the generation of blue monochromatic emission in OLED devices remains an important problem, which makes it difficult to obtain full white electroluminescence. − At present time, the main sources of blue electroluminescence emission include organic aromatic molecules, organic polymers, − and transition metal complexes of Ir­(III), Os­(II), and Pt­(II). − However, a number of disadvantages of such emitters still hinder their widespread practical use. First of all, fully organic molecules are insufficiently stable, which shortens their durability and requires a more elegant molecular engineering solution and elaboration of protective encapsulating coatings .…”

Efficient 1-(thiophen-2-yl)isoquinoline-based ionic iridophosphors with bulky counterions for solution-processed deep-red electroluminescence

“…The results are consistent with those for the reported analogues. 18,24 The calculated energy levels of the LUMO and HOMO, and E g opt for Irb at the ground state are −5.35 eV, −2.29 eV, and 3.06 eV, respectively.…”

“…The results are consistent with those for the reported analogues. 18,24 The calculated energy levels of the LUMO and HOMO, and E g opt for Irb at the ground state are −5.35 eV, −2.29 eV, and 3.06 eV, respectively. (TPBi) (50 nm)/lithium fluoride (LiF) (1 nm)/aluminium (Al) (100 nm), where indium tin oxide is the anode, m-PEDOT:PSS serves as the hole injection layer (HIL), and TPBi serves as the hole transport layer (HTL), respectively.…”

An AIE Metal Iridium Complex: Photophysical Properties and Singlet Oxygen Generation Capacity

“…Iridium complexes, compared to other transition metal complexes, exhibit excellent photochemical and physical stability, large Stokes shift, and high intersystem crossover ability [14]. Consequently, they have emerged as extensively utilized transition metal complex materials across various domains such as bioimaging, electroluminescence, and photodynamic therapy [15][16][17][18][19]. Notably, iridium complexes have been extensively investigated as photosensitizers in photodynamic therapy [20,21].…”