26‐3: Invited Paper: High Performance and Long Device Lifetime Organic Light‐emitting Diodes Using a Tetradentate Platinum (II) Emitter

Abstract

The realization of high performance green organic light emitting diodes with long device lifetime using a platinum emitter is demonstrated in this work. The platinum emitter shows a short emission lifetime of 2.7 μs in thin film and a high Td of 489 °C. The Pt OLED with 9 wt% doping concentration exhibited an EQE of up to 20.4% and a current efficiency of up to 70.6 cd A−1 at a current density (luminance) of 20 mA cm−2 (14110 cd m−2), respectively. Notably, a respectable device lifetime (LT95) of 373 h at 10000 cd m−2 has been achieved, and this value is comparable to the reference Ir complex.

Simplified Green-Emitting Single-Layer Phosphorescent Organic Light-Emitting Diodes with an External Quantum Efficiency > 22%

“…Finally, to ascertain the efficiency of the D -spiro- A molecular design in the SL-PhOLED performance, Ir­(ppy) 2 acac-based SL-PhOLEDs using two commercially available host materials, CBP (HOMO/LUMO: −5.56/-2.09 eV, E T = 2.69 eV) and 1,3-bis­( N -carbazolyl)­benzene (mCP, HOMO/LUMO: −5.64/–1.90 eV, E T = 3.05 eV), have been fabricated. These hosts are commonly found in the literature in high-performance devices. ,− For the purpose of this work and to keep consistency, HOMO, LUMO, and E T levels of CBP and mCP have been measured in identical conditions than that used for SQPTZ-2-FPOPh 2 (see Supporting Information Figures S14 and S15 and Table S5). The architecture of these benchmark devices is identical to those reported above, and the different performance can then only be ascribed to the host.…”

“…These hosts are commonly found in literature in high performance devices. 24,[59][60][61][62] For the purpose of this work and to keep consistency HOMO, LUMO and E T levels of CBP and mCP have been measured in identical conditions than that used for SQPTZ-2-FPOPh 2 (see SI Figures S14-15 and Table S5). The architecture of these benchmark devices is identical to those reported above and the different performance can then only be ascribed to the host.…”

Tetradentate Pt[O^N^C^N] complexes with peripheral diarylamino substituents for high-performance and stable green organic light-emitting diodes with LT95 of 17 140 h at 1000 cd m−2

“…[18][19][20] Spatially bulky phosphorescent tetradentate Pt(II) complexes generally exhibit excellent electroluminescent properties, which can be tuned by modifying the core ligand backbone and/or peripheral substituents, making them competitive in different applications involving organic display and lighting technologies. 21,22 Previously, Che and co-workers developed a set of green emitting tetradentate Pt[O^N^C^N] complexes. [23][24][25][26][27][28] These complexes possess high thermal stability and exhibit high PLQY in solutions and doped films.…”

“…18–20 Spatially bulky phosphorescent tetradentate Pt( ii ) complexes generally exhibit excellent electroluminescent properties, which can be tuned by modifying the core ligand backbone and/or peripheral substituents, making them competitive in different applications involving organic display and lighting technologies. 21,22…”

Predictions of photophysical properties of phosphorescent platinum(II) complexes based on ensemble machine learning approach

“…Over the last decade, the research on platinum-based PhOLEDs has steadily increased in popularity and the device performances have been improved with the introduction of tetradentate cyclometalating ligands. [4][5][6][7][8] In fact, however, it would require substantial cost and efforts to develop high-performance PhOLED emitters experimentally, as the relationship between molecular structures and photophysical properties with interest is complicated and has not been elucidated adequately.…”