Výsledky vyhledávání - "Byeong-Hak Ha"

Direct formation of random wrinkle on emission surface for improved light out coupling and stable angular spectrum of white organic light emitting diodes

Autor: Byoung-Gon Yu, Sohyeon Kang, Chul Woong Joo, Jaehyun Moon, Jonghee Lee, Jiwhan Noh, Nam Sung Cho, Byeong-Hak Ha, Jooyeon Kim

Publikováno v: Journal of Luminescence. 205:66-71

To enhance the light out coupling and stabilize the angular spectrum of white organic light emitting diodes (WOLEDs), we formed a randomly distributed corrugation directly on the external glass surface. Using a metallic master, which was prepared usi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fa185c637c2a15f7278a908873a5673d
https://doi.org/10.1016/j.jlumin.2018.09.003

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Fast and direct engraving of iridescent lettering on original product surface using laser interference to prevent counterfeiting

Autor: Byeong-Hak Ha, Sanghoon Ahn, Han-Sung Bae, Heeshin Kang, Jeng-o Kim, Jiwhan Noh

Publikováno v: Optics and Lasers in Engineering. 107:214-220

We propose the engraving of a unique interference pattern on metal with the use of high-energy 1064 nm laser pulses fired through a Fresnel biprism (FB). The grating is patterned with 500 patterns for 5 ns, and the spacing of patterns can be adjusted

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::327313afccb46f3b32010574b9096042
https://doi.org/10.1016/j.optlaseng.2018.03.024

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