Fig. 8

1D uniformly doped microstructures for optical waveguides. a Molecular structure of perylene and TPI. b Schematic representation of the annular cavity of the binary microtube, and energy diagrams for the IFRET and RER processes. c-d Spatially resolved PL spectra of out-coupled light for a single binary microrod and microtube, respectively. e-f The corresponding linear fit of the PL spectra of microrod and microtube versus excitation position, respectively. g Molecular structures of DPA and (BT)₂Ir(acac). h Emission spectra of the DPA nanowires with different doping contents (BT)₂Ir(acac) excited with a 360 nm laser. i Bright-field and PL images of the microwire with (BT)₂Ir(acac) contents of 0.2%, Scale bars: 5 μm. j Corresponding spatially resolved PL spectra collected from tips of microrod in i. k Emission spectra of the DPA nanowires with different doping contents (BT)₂Ir(acac) excited with a 500 nm laser. l Bright-field and PL images of the microwire with (BT)₂Ir(acac) contents of 1%, Scale bars: 5 μm. m Corresponding spatially resolved PL spectra collected from tips of microtube in l. a-f Reprinted with permission from ref. [43] Copyright 2009, Wiley-VCH. g-m Reprinted with permission from ref. [29] Copyright 2011, Wiley-VCH