Full‐color Persistent Room‐temperature Phosphorescence from Carbon Dot Composites Based on a Single Nonaromatic Carbon Source

Abstract

Herein, a series of carbon dot composites (CDC) with full‐color and long‐lived room‐temperature phosphorescence (RTP) are prepared by a simple solid‐phase one‐step method from a single non‐conjugated and non‐aromatic carbon source. The RTP emission wavelength can be adjusted from 462 to 623 nm by changing the feeding ratio and reaction temperature. The luminescent lifetime and quantum yield of a green emissive CDC (AB‐CDC‐3) reach 1.1 s and 39%, respectively, because of the close interaction between carbon dots and inorganic matrix. Due to the existence of multiple luminescent centers, these CDC exhibit excitation wavelength‐dependent RTP and a white emission when excited at a specific wavelength. A single‐component afterglow luminescent diode based on AB‐CDC‐4 shows a high‐quality white emission with CIE of (0.30, 0.33) and color‐rendering index of 88. Based on the unique photophysical properties of the composites, they exhibit huge application potential in the field of multilevel anti‐counterfeiting, fingerprint identification, and optoelectronic devices.

Facile Synthesis of B/P Co-Doping Multicolor Emissive Carbon Dots Derived from Phenylenediamine Isomers and Their Application in Anticounterfeiting

“…The XPS O 1s spectra in multicolor CDs mainly contain three types of oxygen bonds that can be assigned to C=O (531.2 eV), C-O-C (532.5 eV), and C-O/P-O (533.8 eV), as shown, respectively, in Figure 3g-l [30]. Furthermore, in Figure S1a-c, deconvolution of the B 1s spectra of the multicolor CDs expresses B-N, B-O, and B-CO 2 bonds located at approximately 190.1 eV, 191.4 eV, and 192.8 eV, respectively[54]. The high-resolution P 2p spectra of the multicolor CDs could be deconvoluted into two peaks, exhibiting two peaks at 133.9 eV and 134.9 eV for P-O/P=O and P-N bonds, which are shown in FigureS1d-f[17].…”

“…Finally, the characteristic peaks at approximately 1186, 1011, and 864 cm −1 resulted from the stretch vibration of P=O, N-P, and B-O bonds, respectively [44,46]. [54]. The high-resolution P 2p spectra of the multicolor CDs could be deconvoluted into two peaks, exhibiting two peaks at 133.9 eV and 134.9 eV for P-O/P=O and P-N bonds, which are shown in Figure S1d-f [17].…”

Triggering Long Persistent Luminescence From Functionalizable Carbon Dots‐in‐Carbon Nitrides Composites Via Production of Deep‐Traps

“…In this approach, the CDs serve as emitters to generate more photoexcited electrons for radiative transition and control the emission wavelength, while the CNs act as a matrix to embed the CDs and provide long‐lived traps that prolong the afterglow duration. The fixation of CDs efficiently suppresses molecular vibration‐induced non‐radiative transition and stabilizes the triplet states of dispersed CDs, [ 48,49 ] ensuring stability in LPL performance and enhancing initial brightness by promoting room‐temperature phosphorescence (RTP) and/or TADF. Furthermore, the plentiful surface amino groups on CNs can serve as the reaction sites for subsequent chemical bonding, enabling further modification and functionalization capabilities for these composites.…”

Regulation and application of organic luminescence from low-dimensional organic–inorganic hybrid metal halides

“…126 The most common anti-counterfeiting method is image-hiding technology, which effectively hides real image information by utilizing the changes in optical properties such as light color and luminescence time. [127][128][129] To prevent real information from being easily deciphered and to realize advanced encryption, the optical substrates employed for fabricating anti-counterfeiting patterns must possess diverse light response properties. Therefore, long afterglow LDMH materials with high luminous efficiency and tunable multi-color emission stand out in anti-counterfeiting research.…”