One-step vapor-phase synthesis of transparent high refractive index sulfur-containing polymers

Do Heung Kim, Wontae Jang, Keonwoo Choi, Ji Sung Choi, Jeffrey Pyun, Jeewoo Lim, Kookheon Char, Sung Gap Im

Research output: Contribution to journalArticle

Abstract

High refractive index polymers (HRIPs) have recently emerged as an important class of materials for use in a variety of optoelectronic devices including image sensors, lithography, and light-emitting diodes. However, achieving polymers having refractive index exceeding 1.8 while maintaining full transparency in the visible range still remains formidably challenging. Here, we present a unique one-step vapor-phase process, termed sulfur chemical vapor deposition, to generate highly stable, ultrahigh refractive index (n > 1.9) polymers directly from elemental sulfur. The deposition process involved vapor-phase radical polymerization between elemental sulfur and vinyl monomers to provide polymer films with controlled thickness and sulfur content, along with the refractive index as high as 1.91. Notably, the HRIP thin film showed unprecedented optical transparency throughout the visible range, attributed to the absence of long polysulfide segments within the polymer, which will serve as a key component in a wide range of optical devices.

Original languageEnglish (US)
Pages (from-to)eabb5320
JournalScience Advances
Volume6
Issue number28
DOIs
StatePublished - Jul 1 2020

ASJC Scopus subject areas

  • General

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