Journal
SCIENCE ADVANCES
Volume 4, Issue 5, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aas9732
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Funding
- Natural Science Foundation of China [21404017]
- special program of Chongqing Science and Technology Commission [cstc2016shmszx80052, cstc2017zdcy-zdyfX0007]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJ1709223]
- Singapore Academic Research Fund [RG19/16, RG121/16, RG11/17]
- Singapore Agency for Science, Technology and Research Advanced Manufacturing and Engineering Individual Research Grant [A1783c0007]
- China Scholarship Council [201508505177]
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Ultralong room temperature phosphorescence (URTP) emitted from pure amorphous organic molecules is very rare. Although a few crystalline organic molecules could realize URTP with long lifetimes (>100 ms), practical applications of these crystalline organic phosphors are still challenging because the formation and maintenance of high-quality crystals are very difficult and complicated. Herein, we present a rational design for minimizing the vibrational dissipation of pure amorphous organic molecules to achieve URTP. By using this strategy, a series of URTP films with long lifetimes and high phosphorescent quantum yields (up to 0.75 s and 11.23%, respectively) were obtained from amorphous organic phosphors without visible fluorescence and phosphorescence under ambient conditions. On the basis of the unique features of URTP films, a new green screen printing technology without using any ink was developed toward confidential information encryption and decryption. This work presents a breakthrough strategy in applying amorphous organic materials for URTP.
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