Purine-based thermally activated delayed fluorescence emitters for efficient organic light-emitting diodes

Authors：Wang, Zian; Yao, Jingwen; Zhan, Lisi; Gong, Shaolong; Ma, Dongge^*; Yang, Chuluo^*

Source：Dyes and Pigments, 2020, 180: 108437.

DOI：10.1016/j.dyepig.2020.108437

• Thermally activated delayed fluorescence
• Organic light-emitting diode
• Purine

Organic fluorescent materials possessing thermally activated delayed fluorescence (TADF) characteristics have attracted tremendous attention. Herein, two TADF emitters (1PXZP and 2PXZP) based on a novel biological base acceptor of 9-methylpurine and commonly used donor of phenoxazine (PXZ) have been successfully synthesized and characterized. Both target compounds possess nearly orthogonal configurations to reduce singlet-triplet splitting energy (Delta E-ST) for remarkable TADF character. The two emitters show good photoluminescence quantum yields (PLQYs), and thus the organic light-emitting diodes employing 1PXZP and 2PXZP as emitters display good performance with maximum external quantum efficiencies of 10.6% and 13.8%, respectively. The efficiencies of 1PXZP based device show nearly no roll-off at 100 cd m(-2) luminance due to the short delayed lifetime (tau(d)) of 3.2 mu s. This work manifests that the biological base is a promising acceptor for designing TADF materials.

• Institution
  武汉大学