期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 28, 期 48, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202201605
关键词
narrowband emission; organoboron compound; organic light-emitting device; thermally activated delayed fluorescence
资金
- Japan Science and Technology Agency, JST, through their Center of Innovation (COI) Program
- New Energy and Industrial Technology Development Organization (NEDO)
- JSPS KAKENHI [20H02807]
In this study, multiresonant thermally activated delayed fluorescent (TADF) materials embedded with nitrogen-boron-oxygen (N-B-O) were synthesized and characterized, with color-tunability between blue and green. The three emitter materials exhibited high photoluminescence quantum yield (PLQY) and narrow full width at half maximum (FWHM). By regulating the nonbonding/bonding molecular orbital characters, the emission color of m-DiNBO and p-DiNBO could be tuned from blue to green. Due to their expanded planar molecular structure, m-DiNBO and p-DiNBO showed high horizontal dipole ratio. OLEDs prepared with these materials exhibited high external quantum efficiencies and pure-color emission of different colors.
In this study, we synthesized and characterized multiresonant thermally activated delayed fluorescent (TADF) materials embedded with nitrogen-boron-oxygen (N-B-O), exhibiting color-tunability between blue and green, namely NBO, m-DiNBO, and p-DiNBO. The three emitter materials showed a high photoluminescence quantum yield (PLQY) and a state-of-the-art narrow full width at half maximum (FWHM) of 96 %/25 nm, 87 %/17 nm, and 99 %/19 nm, respectively. For m-DiNBO and p-DiNBO, the emission color could be tuned from blue to green by regulating the nonbonding/bonding molecular orbital characters. Owing to the expanded planar molecular structure, m-DiNBO and p-DiNBO showed high horizontal dipole ratio (Theta) of 88 % and 92 %, respectively. OLEDs were prepared with NBO, m-DiNBO, and p-DiNBO, exhibiting high external quantum efficiencies of 16.8 %, 24.2 %, and 21.6 %, respectively. NBO and m-DiNBO exhibited pure-blue emission with CIE coordinates of (0.137, 0.142) and (0.126, 0.098), respectively. p-DiNBO showed pure-green emission with a CIE coordinate of (0.258, 0.665).
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