B.C. Chang

Continuous blade coating for multi-layer large-area organic light-emitting diode and solar cell

A continuous roll-to-roll compatible blade-coating method for multi-layers of general organic semiconductors is developed. Dissolution of the underlying film during coating is prevented by simultaneously applying heating from the bottom and gentle hot wind from the top. The solvent is immediately expelled and reflow inhibited. This method succeeds for polymers and small molecules. Uniformity is within 10% for 5 cm by 5 cm area with a mean value of tens of nanometers for both organic light-emitting diode (OLED) and solar cell structure with little material waste. For phosphorescent OLED 25 cd/A is achieved for green, 15 cd/A for orange, and 8 cd/A for blue. For fluorescent OLED 4.3 cd/A is achieved for blue, 9 cd/A for orange, and 6.9 cd/A for white. For OLED with 2 cm by 3 cm active area, the luminance variation is within 10%. Power conversion efficiency of 4.1% is achieved for polymer solar cell, similar to spin coating using the same materials. Very-low-cost and high-throughput fabrication of efficient ...

Critical fields and the spontaneous vortex state in the weakly ferromagnetic superconductor RuSr2GdCu2O8

A spontaneous vortex state (SVS) between 30 and 56 K was observed for the weak-ferromagnetic superconductor

Multilayer rapid-drying blade coating for organic solar cells by low boiling point solvents

{\mathrm{RuSr}}_{2}{\mathrm{GdCu}}_{2}{\mathrm{O}}_{8}

Angular dependence of x-ray absorption spectrum for field-aligned iron-based superconductors

with the ferromagnetic Curie temperature

Correlation between oxygen content δ and metal-insulator transition in Sm1.85Ce0.15CuO4 + δ antiferromagnetic superconductors

{T}_{C}=131\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Evidence of d-wave behavior in Pr1.85Ce0.15CuO3.97 aligned superconductors

and the superconducting transition temperature

Non-s-wave behavior of c-axis aligned Pr1.85Ce0.15CuO3.97 superconducting powder

{T}_{c}=56\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Weak ferromagnetic order and possible high-Tc superconductivity in the RuCa2RCu2O8+δ ruthenium-cuprate

. The low-field

Anisotropic structural and magnetic properties of the field-aligned superconducting system SmFeAsO1-xFx (x = 0, 0.1, 0.2, 0.25 and 0.3)

(\ifmmode\pm\else\textpm\fi{}20\phantom{\rule{0.3em}{0ex}}\mathrm{G})

Anisotropic magnetic and superconducting properties of aligned weak-ferromagnetic superconductor RuSr2GdCu2O8

super-conducting hysteresis loop indicates a narrow Meissner state region within the average lower critical field