Fused Cycloalkyl Unit‐Functionalized Tetradentate Pt(II) Complexes for Efficient and Narrow‐Emitting Deep Blue Organic Light‐Emitting Diodes

Author:

Cheong Kiun1,Jo Unhyeok1,Hong Wan Pyo2,Lee Jun Yeob134ORCID

Affiliation:

1. School of Chemical Engineering Sungkyunkwan University 2066, Seobu‐ro, Jangan‐gu Suwon‐si Gyeonggi‐do 16419 Republic of Korea

2. Department of Chemistry Gachon University 1342, Seongnam‐daero,Sujeong‐gu Seongnam‐si Gyeonggi‐do 13120 Republic of Korea

3. SKKU Advanced Institute of Nano Technology Sungkyunkwan University 2066, Seobu‐ro, Jangan‐gu Suwon Gyeonggi 16419 Republic of Korea

4. SKKU Institute of Energy Science and Technology Sungkyunkwan University 2066, Seobu‐ro, Jangan‐gu Suwon Gyeonggi 16419 Republic of Korea

Abstract

AbstractA blue tetradentate Pt(II) complex named Pt‐tmCyCz is developed by introducing a cycloalkyl unit fused to carbazole to improve the rigidity and bulkiness of the complex. The introduction of the tetramethylcyclohexyl (tmCy) group results in a narrow full width at half maximum (FWHM), a high horizontal emitting dipole orientation, doping concentration resistant stable spectrum, and extremely small efficiency roll‐off, and little concentration quenching effect. Phosphorescent organic light‐emitting diodes (OLEDs) doped with Pt‐tmCyCz achieve a high external quantum efficiency (EQE) of 21.5%, with a small EQE roll‐off of 3.8% up to 1000 cd m−2, a small FWHM of 24 nm, and a color coordinate of (0.132, 0.138). Moreover, Pt‐tmCyCz is investigated as a sensitizer in phosphor‐sensitized OLEDs using N7,N7,N13,N13,5,9,11,15‐octaphenyl‐5,9,11,15‐tetrahydro‐5,9,11,15‐tetraaza‐19b,20b‐diboradinaphtho[3,2,1‐de:1′,2′,3′‐jk]pentacene‐7,13‐diamine (νDABNA) as a terminal emitter. The Pt‐tmCyCz:νDABNA device achieves a high EQE of 33.9%, with a small EQE roll‐off of only 8.0% up to 1 000 cd m−2. The results demonstrate that fused tmCy group in carbazole can be an effective building block for the development of high‐performance Pt(II) complexes, which can be utilized as efficient phosphors or sensitizers in OLEDs.

Funder

Ministry of Trade, Industry and Energy

Publisher

Wiley

Subject

General Materials Science,General Chemistry

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