Efficient metal-free organic room temperature phosphors

Nidhankar, Aakash D.; Goudappagouda,; Wakchaure, Vivek Chandrakant; Babu, Sukumaran Santhosh

doi:10.1039/d1sc00446h

Cited by 141 publications

(98 citation statements)

References 123 publications

(113 reference statements)

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“…For example, reversed intersystem crossing (RISC) from triplet to singlet (both from lowest triplet and highlying triplet) has been purposively enhanced by molecule design to realize 100% exciton utilization in organic light-emitting diodes (OLEDs) [4][5][6][7] . In contrast, organic room-temperature phosphorescence (RTP), radiative emission from triplet state promoted by enhancing singlet-triplet ISC process, are also of considerable interest due to their innovative application prospects in fields of bioimaging, information encryption and displays, etc [8][9][10][11][12] . Especially, those phosphors exhibiting ultralong room-temperature phosphorescence (URTP) with luminescence lifetime over 0.1 s, namely afterglow or persistent luminescence, arouse increasing attention because of their revolution to the human naked eyes 13 .…”

Section: Introductionmentioning

confidence: 99%

Converting molecular luminescence to ultralong room-temperature phosphorescence via the excited state modulation of sulfone-containing heteroaromatics

Yang

et al. 2021

Chem. Sci.

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Section: Introductionmentioning

confidence: 99%

Converting molecular luminescence to ultralong room-temperature phosphorescence via the excited state modulation of sulfone-containing heteroaromatics

Yang

et al. 2021

Chem. Sci.

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“…At the same time, it is crucial to reduce the trap concentration in a crystal which is an important factor for triplet quenching, which can be achieved by using crystals of the highest purity. [ 44 ] As an alternative, amorphous RTP materials such as polymers, [ 114 ] are more competitive due to their easier processibility and high environmental stability, although the intrinsic mechanism still needs systematic study and further exploration. Another approach is to develop host‐guest systems which do not require a strict crystalline environment.…”

Section: Discussionmentioning

confidence: 99%

“…introduced a number of typical carbazole‐based phosphors in their review. [ 44 ] Therefore, in our review, we present some additional carbazole‐based phosphors in Section 3.6. Most published reviews do not clearly indicate the significance of impurity effects, and may lead to misunderstandings about RTP research.…”

Section: Introductionmentioning

confidence: 99%

Persistent Room‐Temperature Phosphorescence from Purely Organic Molecules and Multi‐Component Systems

Nitsch

Marder

2021

Advanced Optical Materials

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Recently, luminophores showing efficient room‐temperature phosphorescence (RTP) have gained tremendous interest due to their numerous applications. However, most phosphors are derived from transition metal complexes because of their intrinsic fast intersystem crossing (ISC) induced by strong spin–orbit coupling (SOC) constants of the heavy metal. Metal‐free RTP materials are rare and have become a promising field because they are inexpensive and environmentally friendly. This review summarizes organic molecular materials with long triplet lifetimes at room temperature from the perspective of whether they stem from a molecular or multi‐component system. Among purely organic phosphors, heteroatoms are usually introduced into the backbone in order to boost the singlet–triplet ISC rate constant. In multi‐component systems, useful strategies such as host–guest, polymer matrix, copolymerization, and supramolecular assembly provide a rigid matrix to restrict nonradiative pathways thus realizing ultralong RTP.

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“…[105,106] The recent past witnessed a very large jump in the new molecular design and exploration of organic phosphors, [105,[107][108][109][110][111][112] demonstrating RTP that persists longer than 100 ms with an afterglow and even exceeds the lifetime of 1 s after cessation of excitation. [58,60,113] This ultralong RTP property is enabled by the specific molecular organization of The number on the device label (1 or 2) refers to the compound used (ZY-01 or ZY-02, respectively), while the letters on the labels refer to devices with different geometrical parameters, as reported in Ref. [82].…”

Section: Gqds For Long-lived Luminescencementioning

confidence: 99%

Large Polycyclic Aromatic Hydrocarbons as Graphene Quantum Dots: from Synthesis to Spectroscopy and Photonics

Paternò

Goudappagouda

Chen

et al. 2021

Advanced Optical Materials

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The well-known advantages of OSCs over their inorganic counterparts lie essentially in their relatively high absorption coefficient (α ≈ 10 5 cm −1 ) and photoluminescence (PL) quantum yield, as well as their high solution processability, which reduces device fabrication costs. [4][5][6] All these properties could be further tuned and optimized by rational structure design and chemical synthesis, which have permitted extensive utilization of OSCs as active materials in organic solar cells [7][8][9] and light-emitting diodes (LEDs), [10][11][12] as well as efficient optical gain media in organic lasers. [13][14][15] Large polycyclic aromatic hydrocarbons (PAHs) have emerged in recent decades as unique OSCs with promising optical properties and high chemical and photostability. [16][17][18][19][20][21] These large PAHs, having discrete quasi-zero-dimensional graphene structures, can also be regarded as graphene quantum dots (GQDs). [22][23][24][25][26][27] In contrast to zero-bandgap graphene, the quantum confinement of the wave function in GQDs permits the opening of a finite energy gap, conferring appealing features that can be exploited in optoelectronics and photonics, such as a relatively large Frenkel exciton binding energy [28] and multicolor fluorescence. [29][30][31][32] In the fields of Materials Sciences, GQDs are

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Efficient metal-free organic room temperature phosphors

Abstract: A summary of the extremely efficient organic phosphors that utilized the best possible ways to manipulate the fate of triplet excitons for achieving a long lifetime along with impressive quantum yield and afterglow properties is provided.

Cited by 141 publications

References 123 publications

Converting molecular luminescence to ultralong room-temperature phosphorescence via the excited state modulation of sulfone-containing heteroaromatics

Converting molecular luminescence to ultralong room-temperature phosphorescence via the excited state modulation of sulfone-containing heteroaromatics

Persistent Room‐Temperature Phosphorescence from Purely Organic Molecules and Multi‐Component Systems

Large Polycyclic Aromatic Hydrocarbons as Graphene Quantum Dots: from Synthesis to Spectroscopy and Photonics

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