Abstract:
:Purely organic room temperature phosphorescence (RTP) has attracted wide attention recently due to its various application potentials. However, ultralong RTP (URTP) with high efficiency is still rarely achieved. Herein, by dissolving 1,8-naphthalic anhydride in certain organic solid hosts, URTP with a lifetime of over 600 ms and overall quantum yield of over 20% is realized. Meanwhile, the URTP can also be achieved by mechanical excitation when the host is mechanoluminescent. Femtosecond transient absorption studies reveal that intersystem crossing of the host is accelerated substantially in the presence of a trace amount of 1,8-naphthalic anhydride. Accordingly, we propose that a cluster exciton spanning the host and guest forms as a transient state before the guest acts as an energy trap for the RTP state. The cluster exciton model proposed here is expected to help expand the varieties of purely organic URTP materials based on an advanced understanding of guest/host combinations.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Zhang X,Du L,Zhao W,Zhao Z,Xiong Y,He X,Gao PF,Alam P,Wang C,Li Z,Leng J,Liu J,Zhou C,Lam JWY,Phillips DL,Zhang G,Tang BZdoi
10.1038/s41467-019-13048-xsubject
Has Abstractpub_date
2019-11-14 00:00:00pages
5161issue
1issn
2041-1723pii
10.1038/s41467-019-13048-xjournal_volume
10pub_type
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