image: Figure 1 | Schematics of OPLED structure and angle-resolved reflectivity. (A) Scheme of the TTPSB-microcrystal-based OPLED. (B) The molecular packing along [011] direction. The microcrystal is bounded by ("1""0"" ̅3") and (" ̅1""0""3") crystal planes on the top and bottom surfaces. The transition dipole-moment of TTPSB (blue arrow) along the molecular long-axis is tilted at an angle of 8° with ("1""0"" ̅3") crystal plane. (C) Angle-resolved reflectivity of the microcavity. LP1 and LP2 (red lines) are lower polariton branches caused by strongly coupling between cavity modes and the 0-1 excitons at 570 nm (cyan dotted line). The CM1’ is uncoupled cavity mode. (D) The absorption (blue line) and PL (red line) spectra of the TTPSB microcrystals.
Credit: by Jianbo De, Ruiyang Zhao, Fan Yin, Chunling Gu, Teng Long, Han Huang, Xue Cao, Cunbin An, Bo Liao, Hongbing Fu, Qing Liao
Introduction: Organic light-emitting diodes (OLEDs) have become the mainstream in display technologies due to their lightweight, flexibility, and high efficiency. However, the demand for higher brightness, color purity, and narrowband emission in next-generation ultra-high-definition (UHD) displays has pushed OLEDs to their limits. Conventional OLEDs often suffer from broad emission bandwidth, leading to lower color purity, which hinders their performance in achieving the BT.2020 color standard for UHD displays.
Research Details: In response to these challenges, researchers have developed organic polariton light-emitting diodes (OPLEDs) by strongly coupling organic excitons with optical microcavities. This innovative approach allows for high-brightness, narrowband, and high-color purity emission, making OPLEDs ideal for high-end display applications.
Results and Impact: In a recent paper published in Light: Science & Applications, the research team led by Zhao Ruiyang from Capital Normal University demonstrated the fabrication of OPLEDs with high reflectivity silver mirrors and high-quality single crystals. These OPLEDs exhibit an unprecedented brightness of over 780,000 cd/m² and a narrow emission peak at 627 nm with a full-width at half maximum (FWHM) of only 4.1 nm. The devices achieve near-BT.2020 standard red emission, showcasing their potential for next-generation laser displays.
Conclusion: This breakthrough in OPLED technology not only addresses the limitations of conventional OLEDs but also opens new avenues for ultra-high-definition displays, virtual reality (VR), augmented reality (AR), and other advanced display technologies.
Journal
Light Science & Applications
Article Title
Organic polaritonic light-emitting diodes with high luminance and color purity toward laser displays