Structurally Resemblant Dopants Enhance Organic Room‐Temperature Phosphorescence

Abstract

Doping has shown very promising potential in endowing room‐temperature phosphorescence (RTP) properties of organic phosphors with minimal effort. Here, a new isomer design and doping strategy is reported that is applicable to dibenzothiophene (DBT) and its derivatives. Three isomers are synthesized to study the dopant effect on enhancing RTP of DBT derivatives. It is found that isomer dopants bearing close resemblance to the host with matched highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels and small energy difference between singlet‐ and triplet‐excited states can yield efficient RTP for the doped system. Meanwhile, phosphorescence color from yellow to red is achieved by varying isomer dopants used for doping the DBT derivatives. This work represents an RTP enhancement strategy based on isomer design and doping to construct luminescent organic phosphors.

A Class of Organic Units Featuring Matrix-controlled Color-tunable Ultralong Organic Room Temperature Phosphorescence

“…PNCz was chosen as the matrix powder for it has a resemblant chemical structure with the guest molecule, which is beneficial to charge transfer among molecules of the matrix and the guest. [46] At room temperature, the PNCz powder showed blue emission peaked at 450 nm with a lifetime of 6.5 ms, and a weak shoulder band ranging from 550 nm ~ 650 nm with a lifetime of 11.1 ms (Figure S38), indicating that it does not achieve visible yellow ultralong phosphorescence at room temperature (Figure 4a). However, when PNNA-1 and PNNA-2 were dispersed into the PNCz powder at low concentrations (0.1 wt.% -10 wt.%) separately, yellow UORTP could be observed from the PNNA-1@PNCz and PNNA-2@PNCz doped powders.…”

“…Unexpectedly, when PNNA-1 and PNNA-2 are doped into the powder matrix (PNCz), yellow more than green UORTP can be observed because their cation radicals can be stabilized by the matrix and the redshift of ultralong phosphorescence is probably due to that strong intermolecular interactions are formed between the cation radicals and PNCz because of their high molecular structure similarity. [46] As PNNA-1 and PNNA-2 are dispersed into powder matrixes with low molecular structure similarity (BBP and DBT), green UORTP without redshift appears from the doped systems. To our surprise, N-1, N-2 and their derivatives perform much better than Bd (H-benzo[f]indole) and its derivatives in UORTP.…”

Multicolor-tunable room-temperature afterglow and circularly polarized luminescence in chirality-induced coordination assemblies

“…to promote the intersystem crossing (ISC) and providing a robust environment to suppress the non-radiative decay, such as crystal engineering 10,11 and guest-doping into host matrices. 12–15…”

“…to promote the intersystem crossing (ISC) and providing a robust environment to suppress the non-radiative decay, such as crystal engineering 10,11 and guest-doping into host matrices. [12][13][14][15] Recently, ORTP entered a new development stage, namely, dynamic RTP. Compared to static RTP, the phosphorescence behaviors including emission range, lifetime, and emission type, can generate a dynamic response, such as light-, heating-, pH-, or mechanical-responsive RTP.…”

A Readily Obtained Alternative of 1H-benzo[f]indole towards Room Temperature Ultralong Organic Phosphorescence

“…Screening the literatures, we can find that guest-matrix systems play a vital role in promoting room temprature ultralong organic phosphorescenece (RTUOP). [21][22][23][24][25] Particularly, the Bd/Cz (1H-benzo[f]indole/carbazole) guest-matrix systems, where Bd derivatives and Cz derivatives function as the guest and the matrix, respectively, have been widely studied in the past several years. [26][27][28][29] In our previous work, 29 it is revealed that Bd or its derivatives show (photo-activated) RTUOP in polymers such as PMMA or solid powders such as DMAP and Cz derivatives.…”