The first aggregation-induced emission fluorophore as a solution processed host material in hybrid white organic light-emitting diodes

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题名:	The first aggregation-induced emission fluorophore as a solution processed host material in hybrid white organic light-emitting diodes
作者:	陳錦地;Lee, Yi-Ting;Chang, Yung-Ting;Chen, Chao-Tsen;Chen, Chin-Ti
贡献者:	理學院化學學系
关键词:	Chemical compounds;Colors (materials);Dopants;Fluorescence;Organic light emitting diodes;Spectroscopy;Thin films
日期:	2016-01-01
上传时间:	2026-04-21 14:42:03 (UTC+8)
出版者:	Royal Society of Chemistry;Royal Society of Chemistry (RSC)
摘要:	摘要： A judicious structure design of bis(3,5-di(9 H -carbazol-9-yl)phenyl)amine (CzPA) and 1,1,2,2-tetraphenylethene (TPE) hybrid generates the first aggregation-induced emission (AIE) fluorophore, CzPATPE , as a solution processed host material in a hybrid white organic light-emitting diode (OLED). Small molecule CzPATPE has been verified for the amorphous characteristics by a featureless halo in powder X-ray diffraction spectra and a glass transition temperature as high as 180 °C. Fluorescence images indicate that a homogenous thin film of CzPATPE is obtained from a solution drop-casting process. Solution (THF/water) fluorescence spectroscopy study clearly demonstrates typical AIE properties of CzPATPE . Whereas CzPATPE is virtually non-emissive in common organic solvents, thin film photoluminescence (PL) spectroscopy shows that CzPATPE has a strong sky blue emission around 495 nm with a relatively wide full width at half maximum (FWHM) about 95 nm and a reasonable PL quantum yield of 40%. Low temperature time-gated PL spectroscopy identifies CzPATPE 's triplet optical gap energy E T ∼ 2.05-2.16 eV, which is barely enough for the phosphorescent dopant, tris(2-phenylquinoline) iridium( iii ) (Ir(2-phq) 3 ) ( E T ∼ 2.13 eV). CzPATPE is solution processable to be a sky blue emissive host material for an orange dopant in the hybrid white OLED, ITO/PEDOT:PSS (65 nm)/ CzPATPE :Ir(2-phq) 3 (99.9 : 0.1, ∼40 nm)/TmPyPB (50 nm)/CsF (2 nm)/Al (100 nm). This AIE hybrid white OLED displays white electroluminescence (EL) with a colour chromaticity of CIE x , y (0.36, 0.43). Although the maximum EL efficiency is modest 3.4 cd A −1 or 1.8 lm W −1 , the white OLED has a colour rendering index (CRI) of 72, which is unusually high considering the orange dopant and a two-colour white feature. We attribute such CRI to the relatively large FWHM of CzPATPE . The CzPATPE AIE fluorophore for a solution processed host material in hybrid white OLEDs. 出版者： Royal Society of Chemistry (RSC) 出版日期： 2016 出處： Journal of Materials Chemistry C, 2016, Vol.4 (29), p.7020-7025 資源來源： Royal Society of Chemistry 識別號： ISSN: 2050-7526 識別號： EISSN: 2050-7534 識別號： DOI: 10.1039/c6tc01251e
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