Room Temperature Phosphorescence of Metal-Free Organic Materials in Amorphous Polymer Matrices

Title
Room Temperature Phosphorescence of Metal-Free Organic Materials in Amorphous Polymer Matrices
Authors
육지호
Issue Date
2013
Publisher
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Series/Report no.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY; vol.135 no.16 startpage 6325 endpage 6329
Abstract
Developing metal-free organic phosphorescent materials is promising but challenging because achieving emissive triplet relaxation that outcompetes the vibrational loss of triplets, a key process to achieving phosphorescence, is difficult without heavy metal atoms. While recent studies reveal that bright room temperature phosphorescence can be realized in purely organic crystalline materials through directed halogen bonding, these organic phosphors still have limitations to practical applications due to the stringent requirement of high quality crystal formation. Here we report bright room temperature phosphorescence by embedding a purely organic phosphor into an amorphous glassy polymer matrix. Our study implies that the reduced beta (β)-relaxation of isotactic PMMA most efficiently suppresses vibrational triplet decay and allows the embedded organic phosphors to achieve a bright 7.5% phosphorescence quantum yield. We also demonstrate a microfluidic device integrated with a novel temperature sensor based on the metal-free purely organic phosphors in the temperature-sensitive polymer matrix. This unique system has many advantages: (i) simple device structures without feeding additional temperature sensing agents, (ii) bright phosphorescence emission, (iii) a reversible thermal response, and (iv) tunable temperature sensing ranges by using different polymers.
URI
dx.doi.org/10.1021/ja401769g
http://dspace.inha.ac.kr/handle/10505/32952
ISSN
0002-7863
Appears in Collections:
College of Engineering(공과대학) > Applied Organic Materials Engineering (유기응용재료공학) > Local Access Journal, Report (유기응용재료공학 논문, 보고서)

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