Ir(ppy)(3) phosphorescent microrods and nanowires: promising micro-phosphors
Wang, Hao1,2; Liao, Qing1; Fu, Hongbing1; Zeng, Yi1,2; Jiang, Ziwen1,2; Ma, Jinshi1; Yao, Jiannian1
AbstractWe prepared crystalline Ir(ppy)(3) microrods through a facile self-assembly growth method by employing the so-called reprecipitation technique, and Ir(ppy)(3) nanowires by a solvent-evaporation route. Both have lengths up to several tens of micrometer, but possess significantly different diameters: 1 mu m for microrods and 100 nm for nanowires. The electron diffraction (ED) and X-ray diffraction (XRD) results clarify that both microrods and nanowires preferentially grow along the crystal [001] direction. However, the former have a regular hexagonal geometry and single crystalline in nature, while the latter are polycrystalline with a round cross section. Remarkably, microrods and nanowires of Ir(ppy)(3) present distinct optical properties. The phosphorescence decay of Ir(ppy)(3) microrods and nanowires is much faster than that in degassed solution and polymethylmethacrylate (PMMA) film. The phosphorescence green color of microrods is similar to that of Ir(ppy)(3) molecules doped in PMMA films, while nanowires actually emit yellow light probably from the low-energy trap as a result of its polycrystalline nature. Furthermore, the transverse nanoscale and longitudinal microscale dimensions and well-defined faceting nature of microrods enable the observation of evident optical waveguiding. No optically pumped lasing is observed because of intense triplet-triplet exciton annihilation. Our results afford a novel strategy of phosphorescence emission color tuning by controlling the nano- to microstructure dimensions. The microrod phosphorescence waveguides may be used as building blocks for future miniaturized photonic devices.
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WOS IDWOS:000263271900011
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Cited Times:46[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorFu, Hongbing
Affiliation1.Chinese Acad Sci, Inst Chem, BNLMS, Key Lab Photochem, Zhongguancun Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
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Wang, Hao,Liao, Qing,Fu, Hongbing,et al. Ir(ppy)(3) phosphorescent microrods and nanowires: promising micro-phosphors[J]. JOURNAL OF MATERIALS CHEMISTRY,2009,19(1):89-96.
APA Wang, Hao.,Liao, Qing.,Fu, Hongbing.,Zeng, Yi.,Jiang, Ziwen.,...&Yao, Jiannian.(2009).Ir(ppy)(3) phosphorescent microrods and nanowires: promising micro-phosphors.JOURNAL OF MATERIALS CHEMISTRY,19(1),89-96.
MLA Wang, Hao,et al."Ir(ppy)(3) phosphorescent microrods and nanowires: promising micro-phosphors".JOURNAL OF MATERIALS CHEMISTRY 19.1(2009):89-96.
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