Journal
COMPOSITES COMMUNICATIONS
Volume 8, Issue -, Pages 106-110Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.coco.2017.12.005
Keywords
Room temperature phosphorescence; Restricted molecular motions; Cellulose; Ionic bond
Categories
Funding
- National Natural Science Foundation of China [51603050]
- Natural Science Foundation of Guangxi Autonomous Region [2016GXNSFAA380029, 2016GXNSFBA380064]
- Open Project Foundation of Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials [15-KF-10]
- Guangxi Key Laboratory of New Energy and Building Energy Saving [16-J-21-3]
- Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi
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Efficient room temperature phosphorescence (RTP) is rarely observed from rare metal or halogen free polymer materials. However, we have newly observed that Zn2+ doped sodium carboxymethyl cellulose emitting long-lasting phosphorescence at room temperature. It is ascribed to restricted molecular motions (RMM) from strong ionic band and abundant hydrogen bond in crystalline states. Such intermolecular and intramolecular interactions greatly rigidify the molecular conformation and drastically decrease the nonradiative deactivation channels of the triplet excitons, thus phosphorescent emission is greatly boosted at room temperature. The photoluminescence quantum yield and phosphorescence life time of Zn2+ doped carboxymethyl cellulose composites are up to 16.5% and 281 ms, respectively.
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