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Stepwise Molecular Engineering Toward High-Performance Deep-Blue Narrowband OLEDs: Rigidity as the Foundation,

Yitong Zeng¹, Jun-Tao Hu¹, Guo-Xi Yang¹

¹Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials, Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, P. R. China.

Angewandte Chemie (International Ed. in English)

|March 28, 2026

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Achieving pure deep-blue organic light-emitting diodes (OLEDs) is challenging. This study introduces a molecular design strategy to create a novel deep-blue emitter (DBNDICz) with exceptional color purity and efficiency for advanced OLED displays.

Area of Science:

Materials Science
Organic Electronics
Photophysics

Background:

Developing high-color-purity deep-blue emitters for organic light-emitting diodes (OLEDs) meeting the BT.2020 standard is a significant challenge.
Existing deep-blue emitters often suffer from broad emission spectra and insufficient efficiency, limiting their application in next-generation displays.

Purpose of the Study:

To propose a stepwise molecular engineering strategy for simultaneously enhancing the reverse intersystem crossing rate (k_RISC) and narrowing the full-width at half maxima (FWHM) of deep-blue emitters.
To develop a high-performance deep-blue emitter based on a modified diboron multiple-resonance scaffold.

Main Methods:

A stepwise molecular engineering approach involving enhancing molecular rigidity, strengthening resonant strength, and completing molecular symmetry.

Keywords:

BT.2020 deep blue emission multiple‐resonance thermally activated delayed fluorescence operational lifetime organic light‐emitting diodes

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Synthesis and characterization of a novel deep-blue emitter (DBNDICz).

Fabrication and testing of both bottom-emitting and top-emitting OLED devices using the developed emitter.

Main Results:

The synthesized DBNDICz emitter exhibits a peak emission at 452 nm with an ultra-narrow FWHM of 15 nm and a high k_RISC of 3.0 × 10⁵ s^-1.
DBNDICz achieves Commission Internationale de I'Éclairage (CIE) coordinates of (0.144, 0.060) and a high maximum external quantum efficiency (EQE_max) of 24.2% in bottom-emitting OLEDs due to 93% horizontal dipole orientation.
Top-emitting OLEDs demonstrate a record-setting blue index of 514 cd A^-1 CIEy^-1 with CIE (0.146, 0.036) and EQE_max of 45.2%, along with an operational lifetime (LT₅₀) of 154.2 h.

Conclusions:

The developed DBNDICz emitter represents a significant advancement in deep-blue OLED technology, offering superior color purity and efficiency.
The proposed molecular design strategy provides a robust paradigm for creating high-performance narrowband deep-blue thermally activated delayed fluorescence (TADF) emitters.
These findings establish a new benchmark for state-of-the-art deep-blue OLED devices, particularly those with CIEy ≤ 0.06.