Novel phosphorescent polymers containing both ambipolar segments and functionalized Ir^IIIphosphorescent moieties: synthesis, photophysical, redox, and electrophosphorescence investigation

Facilitating triplet energy-transfer in polymetallayne-based phosphorescent polymers with iridium(III) units and the great potential in achieving high electroluminescent performances

“…This result has clearly indicated that polymetallaynes can also show great potential for developing phosphorescent polymers. However, in PL spectra for the solutions of the traditional phosphorescent polymers, the main emission bands generally are induced by the singlet states of the pure organic conjugated main chains and the emission from the phosphorescent units is weak or even cannot be detected properly in some cases [8,12]. Differently, the copolymers P-CO-1 e P-CO-4 can give phosphorescence dominated PL spectra even in solution with low content of Ir III units (Fig.…”

Platinum(ii) polymetallayne-based phosphorescent polymers with enhanced triplet energy-transfer: synthesis, photophysical, electrochemistry, and electrophosphorescent investigation

“…18 Thus, the unique energy-transfer processes aforementioned in these novel phosphorescent copolymers should benefit their EL process. This should represent very important characters of these copolymers, since triplet energy-transfer process can play critical role in the operation of the PHOLEDs.…”

“…16,18,19 and most of them still show much lower EL efficiencies compared with small molecular triplet emitters involved in PHOLEDs made by vacuum deposition method. Another critical issue should be addressed in PHOLEDs based on conjugated phosphorescent polymers is blocking the undesired reverse energy-transfer from the emissive triplet states of the phosphorescent units to the non-emissive triplet states of the conjugated backbones in the phosphorescent polymers.…”

“…16,18,19 and most of them still show much lower EL efficiencies compared with small molecular triplet emitters involved in PHOLEDs made by vacuum deposition method. In addition, the phosphorescent copolymers can furnish yellow-emitting phosphorescent OLEDs (PHOLEDs) with high EL efficiencies with current efficiency ( L ) of 11.49 cd A -1 , external quantum efficiency ( ext ) of 4.38%, power efficiency ( P ) of 3.78 lm W -1 , and red-emitting PHOLEDs with  L of 5.86 cd A -1 ,  ext of 10.1%,  P of 2.29 lm W -1 , representing very decent electroluminescent performances ever achieved by the phosphorescent copolymers.…”

Enhanced Structural Distortions Allowing for Dicyanophenyl‐substituted Emitters with Outstanding Thermally Activated Delayed Fluorescence Characteristics

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Due to the recent progress on large and high-resolution displays, the development of new materials for organic lightemitting diodes (OLEDs) with high electroluminescence efficiency has become one of the forefronts of modern display research. 13 Thus, materials using the TADF mechanism exhibit a great potential as a cost-effective alternative to rare metalbased phosphorescent materials.In here, we like to discuss the synthesis and photoluminescence (PL) characteristics of carbazole-containing terephthalonitrile derivatives (Figure 1) showing outstanding TADF properties. 3 In addition, the development of suitable hosts that may be employed in host-dopant system has become one of the most extensively studied areas in phosphorescentbased OLEDs, because it is well known that the system may suffer from the excitation instability caused by using only the dopant.

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