Efficient Blue Phosphorescent OLEDs with Improved Stability and Color Purity through Judicious Triplet Exciton Management

Klimes, Kody; Zhu, Zhi‐Qiang; Li, Jian

doi:10.1002/adfm.201903068

Title: Efficient Blue Phosphorescent OLEDs with Improved Stability and Color Purity through Judicious Triplet Exciton Management

Journal Article · Thu May 30 00:00:00 EDT 2019 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201903068· OSTI ID:1523672

Klimes, Kody ^[1]; Zhu, Zhi‐Qiang ^[1];

^[1]

Materials Science and Engineering Arizona State University Tempe AZ 85287 USA

Abstract Highly efficient and stable blue phosphorescent organic light‐emitting diodes are achieved by employing a step‐wise graded doping of platinum(II) 9‐(pyridin‐2‐yl)‐2‐(9‐(pyridin‐2‐yl)‐9 H ‐carbazol‐2‐yloxy)‐9 H ‐carbazole (PtNON) in a device setting. A device employing PtNON demonstrates a high peak external quantum efficiency (EQE) of 17.4% with an estimated LT ₇₀ lifetime of over 1330 h at a brightness of 1000 cd m ⁻² . PtNON is then investigated as a “triplet sensitizer” in an alternating donor–acceptor doped emissive layer to further improve the device emission color purity by carefully managing an efficient Förster resonant energy transfer from PtNON to 2,5,8,11‐tetra‐ tert ‐butylperylene as a selected acceptor material. Thus, such OLED devices demonstrate an EQE of 16.9% with color coordinates of (0.16, 0.25) and an estimated luminance (LT ₇₀ ) lifetime of 628 h at a high brightness of 1000 cd m ⁻² .

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Sponsoring Organization:: USDOE

Grant/Contract Number:: EE0007090

OSTI ID:: 1523672

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 29 Journal Issue: 31; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 65 works

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