Control of Multicolor and White Emission by Triplet Energy Transfer

Abstract

A new strategy by manipulating the progress of triplet energy transfer (TET) is developed to realize adjustable multicolor and pure white emission. Donor phosphorescent molecules emits light when encapsulated into polyvinyl alcohol (PVA) through hydrogen bond interactions, and acceptor fluorescent molecules emits light when doped into PVA through cation-π interactions and hydrogen bond interactions. In addition, the triplet to singlet energy transfer process and mechanism are proved using the energy diagram and lifetime. The broadband emission color of the obtained composite film can be easily modulated by simply adjusting the amount and component of dyes, especially the white emission with CIE coordinates of (0.339, 0.337). This work provides a facile and versatile method for the development of multicolor and pure white-light-emitting diodes, which uses the interactions to light up luminescence properties, and can further aid in the wide development of applications for TET in various other fields.

Tuning Multicolor Emission of Manganese-Activated Gallogermanate Nanophosphors by Regulating Mn Ions Occupying Sites for Multiple Anti-Counterfeiting Application

“…The synthesis procedure of Zn 2. 4 Li 0.6 Ga 2 GeO 8 :Mn phosphors by hydrothermal method was similar to that of Zn 3 Li 0.4 Ga 1.6 GeO 8 :0.25% Mn only via 0.6 mL 0.5 M LiNO 3 substituting for 20% Zn(NO 3 ) 2 . According to our previous study [8,11], 20% Li substitution is an optimal doping concentration.…”

“…The synthesis procedure of Zn 2. 4 Li 0.6 Ga 2 GeO 8 :Mn phosphor synthesized by a solid state reaction approach was similar to that of Zn 3 Ga 2 GeO 8 :0.25% Mn only via Li substituting for 20% ZnO.…”

“…Zn 2. 4 Li 0.6 Ga 2 GeO 8 :Mn samples synthesized by a hydrothermal approach, as shown in Figure 1c, are the compounds of cubic ZnGa 2 O 4 (JCPDS No. 01-071-0843) with an Fd3m space group and rhombohedral Zn 2 GeO 4 (JCPDS No.…”

“…The ability to tune the luminescent color of materials is essential for various applications, such as anti-counterfeiting, three-dimensional displays, information coding, bioimaging, optoelectronic devices and luminescent labeling [1][2][3]. Conventional approaches involve utilizing specially designed organic dyes or quantum dots upon ultraviolet or blue light excitation, where the emission color is modulated by tuning the wavelengths or the power density of excitation light [4,5], thus posing limitations in the resolution of imaging due to auto-fluorescence. Persistent luminescence (PersL) phosphors, which can emit luminescence lasting for hours after the stoppage of the excitation light [6], are particularly suitable for such imaging applications as they emit no background fluorescence [7,8].…”

Interface Engineering of Bi‐Fluorescence Molecules for High‐Performance Data Encryption and Ultralow UV‐Light Detection

“…Tunable excited state luminescence, where a photoexcited material system precisely controls the outcome of the photophysical and photochemical properties of another emissive system, is a very promising strategy for the regulation of excited states correlated luminescence. [22][23][24][25][26][27][28][29][30][31] In such systems, emissions of organic chromophore at different excited states are probably controlled by optically excited neighboring photoactive species. To successfully implement such a strategy, a proper regulator is essentially needed.…”