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| 題名: | 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 |
| 貢獻者: | 理學院化學學系 |
| 關鍵詞: | Chemical compounds;Colors (materials);Dopants;Fluorescence;Organic light emitting diodes;Spectroscopy;Thin films |
| 日期: | 2016-01-01 |
| 上傳時間: | 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 |
| 顯示於類別: | [化學學系] 期刊論文
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