Related Experiment Video
Updated: Feb 3, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
Published on: April 28, 2016
Boron-Nitrogen Multi-Resonance Framework With Heptagon-Fused Carbazole and Spiro-Locking Units Enables Extremely
Zhiyi Chen1, Zhenghao Zhang1, Zhuixing Xue1
1Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
Abstract:
Achieving high efficiency, narrow emission bandwidth, and long operational stability simultaneously remains a major challenge for organic light-emitting diodes (OLEDs) in ultra-high-definition (UHD) displays. Herein, we report a synergistic molecular design integrating boron-nitrogen-based multiple resonance (MR) frameworks with π-extended heptagon-fused carbazole (HpCz) and dibenzo-carbazole (DBCz) units, reinforced by a spiro-locking architecture. This dual strategy enhances molecular rigidity, suppresses vibronic coupling, and improves chemical stability. The resulting emitters, DBCzB-Fl and HpCzB-Fl, exhibit narrow green emission with full-widths at half-maximum of 26 (0.114 eV) and 22 nm (0.080 eV), respectively. OLEDs based on HpCzB-Fl achieve an external quantum efficiency of 27.7%, a current efficiency of 113.0 cd·A-1, a power efficiency of 126.8 lm·W-1, and an operational lifetime (LT90 at 1000 cd·m-2) of 17811 h, which is 2.3 times longer than its DBCz analogue. The superior performance and stability arise from the HpCz-spiro synergy, offering a robust design paradigm for stabilizing MR frameworks while maintaining spectral precision for next-generation UHD display technologies.
Related Concept Videos
The Nitrogen Cycle
Reclosers and Fuses
A comprehensive protection scheme for radial distribution...
Resonance
Self-Locking Screw
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
Circuit Breaker and Fuse Selection
In high-voltage systems,...
Overview of Nitrogen Metabolism
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...

