21 research outputs found
Modification of radiation-damage by environmental factors, as demon- strated by incorporation of 32p into nucleic acids of gamma- -irradiated ehrlich ascites-tumour cells.
Familialisation Effects of the State Welfare: Focused on the National Health Insurances in S. Korea and Taiwan
PCN61 Associations Of Metformin Use With Mortality And Disease Progression After Curative Hepatic Resection In Hepatocellular Carcinoma With Type 2 Diabetes Mellitus: A Nationwide Population-Based Study
Associations Of Metformin Use With Mortality And Disease Progression After Curative Hepatic Resection In Hepatocellular Carcinoma With Type 2 Diabetes Mellitus: A Nationwide Population-Based Study
Free-standing and ultrathin inorganic light-emitting diode array
We report on the fabrication and characteristics of an individually addressable gallium nitride (GaN) microdisk light-emitting diode (LED) array in free-standing and ultrathin form. A high-quality GaN microdisk array with n-GaN, InGaN/ GaN quantum wells and p-GaN layers was epitaxially grown on graphene microdots patterned on SiO2/Si substrates. Due to the weak attachment of the graphene microdots to the growth substrate, a microdisk array coated with a polyimide layer was easily separated from the substrate using mechanical or chemical methods to form an ultrathin free-standing film. Individually addressable microdisk LEDs were created by forming thin metal contacts on the p-GaN and n-GaN surfaces in a crossbar configuration. Each microdisk LED that comprised an ultrahigh resolution array of 2500 pixels per inch was found to be uniquely addressable. The devices in free-standing form exhibited stable electrical and optoelectronic characteristics under extreme bending conditions and continuous operation mode despite the absence of a heat dissipating substrate. These results present promising approaches for the fabrication of high-quality inorganic semiconductor devices for ultrahigh resolution and high-performance flexible applications