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A Rigid Tetradentate Pt(II) Complex for Ultrastable Green OLED with Microcavity-Enhanced Color Purity.

Feng Zhan¹, Kewei Xu¹, Pan Tong¹

¹Center for Phosphorescent Material Research, State Key Laboratory of Green Chemical Synthesis and Conversion, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, P. R. China.

ACS Applied Materials & Interfaces

|April 16, 2026

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Researchers developed a novel platinum complex, Pt-ONP, for organic light-emitting diodes (OLEDs). This breakthrough achieves exceptional green color purity and the longest operational lifetime for pure-green OLEDs, paving the way for advanced displays.

Area of Science:

Materials Science
Organic Electronics
Photophysics

Background:

Achieving high color purity and operational longevity in organic light-emitting diodes (OLEDs) is critical for next-generation display technologies.
Existing pure-green OLED emitters often compromise either color quality or device stability.

Purpose of the Study:

To design and synthesize a novel rigid tetradentate platinum(II) complex, Pt-ONP, for high-performance top-emitting OLEDs (TE-OLEDs).
To evaluate the photophysical properties, color purity, and operational stability of TE-OLEDs utilizing the Pt-ONP emitter.

Main Methods:

Rational molecular design of Pt-ONP by extending π-conjugation and increasing steric hindrance.
Fabrication and characterization of TE-OLED devices incorporating the Pt-ONP complex.

Keywords:

narrowband emission pure green emission tetradentate Pt(II) complexes top-emitting OLED ultrastable OLED

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Performance evaluation including emission spectra, efficiency, color coordinates, and accelerated lifetime testing.

Main Results:

The Pt-ONP based TE-OLED demonstrated pure green emission (peak at 526 nm, FWHM of 28.6 nm, CIE coordinates (0.246, 0.713)).
Achieved high current efficiency of 120.0 cd/A.
Exhibited unprecedented operational stability with an estimated LT₉₀ exceeding 225,000 hours at 1000 cd/m², approximately 18-fold longer than previous records for pure-green OLEDs.

Conclusions:

The Pt-ONP complex offers a promising solution for achieving both high color purity and exceptional operational lifetime in pure-green OLEDs.
The synergistic effects of molecular rigidification and microcavity engineering are crucial for enhancing OLED performance.
This work establishes a new benchmark for pure-green OLED emitters, advancing the development of advanced display technologies.