Related Experiment Video
Updated: May 3, 2026
10:18
Blue-hazard-free Candlelight OLED
Published on: March 19, 2017
9.8K
High-Color-Purity Blue OLEDs with a Small Efficiency Roll-Off Enabled by a Cyanoregulated Tetradentate Platinum(II)
Hongjian Zheng1, Kewei Xu1, Feng Zhan1
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.
Inorganic Chemistry
|November 10, 2025
Summary
Researchers developed a new platinum(II) emitter (PtON-CN) for organic light-emitting diodes (OLEDs). This functionalized emitter improves electron injection and color purity, leading to high efficiency and reduced roll-off in OLED devices.
Area of Science:
- Materials Science
- Organic Electronics
- Photochemistry
Background:
- Organic light-emitting diodes (OLEDs) are crucial for advanced displays.
- Emitter performance is key to OLED device efficiency and color quality.
- Developing novel emitters with enhanced properties is an ongoing research area.
Purpose of the Study:
- To synthesize and characterize a new tetradentate Pt(II) emitter, PtON-CN.
- To investigate the effect of cyano (CN) group functionalization on the emitter's electronic and optical properties.
- To evaluate the performance of the PtON-CN emitter in an OLED device.
Main Methods:
- Synthesis of the Pt(II) complex with cyano group functionalization.
- Photophysical characterization in solution and film states (emission spectra, lifetime, quantum efficiency).
- Fabrication and testing of OLED devices incorporating the PtON-CN emitter.
Main Results:
- PtON-CN exhibits modulated frontier molecular orbital energy levels, enhancing electron injection.
- The emitter shows narrow emission (FWHM 20 nm) with high quantum efficiency (95%) and a short excited-state lifetime (2.7 μs).
- The fabricated OLED device achieved a high external quantum efficiency (EQEmax) of 20.6% with minimal efficiency roll-off (3.4%).
Conclusions:
- The cyano functionalization effectively improves electron injection and color purity in Pt(II) emitters.
- PtON-CN demonstrates excellent photophysical properties suitable for high-performance OLEDs.
- The developed emitter offers a promising pathway for efficient and stable full-color display technologies.
Related Concept Videos
02:39Indicators
45.1K
Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH...
45.1K
03:02Colors and Magnetism
12.1K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.1K
01:22Photoreceptors and Visual Pathways
8.5K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
8.5K
01:24Color Vision
2.0K
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
2.0K