White Polymer Light-emitting Diodes Research Articles

Fluorene-containing polyhedral oligomericsilsesquioxanes modified hyperbranched polymer for white light-emitting diodes with ultra-high color rendering index of 96

In this work, a series of hyperbranched white-emitting conjugated polymers were synthesized with polyfluorene (PF) as the branches and three-dimensional-structured spiro[3.3]heptane-2,6-dispirofluorene (SDF) as the conjugated branching point by one-pot Suzuki polycondensation, where 4,7-dithienyl-2,1,3-benzothiadiazole (DBT) as orange-light emitting unit and fluorene-containing polyhedral oligomericsilsesquioxanes (POSSs) as conjugated linking monomer were introduced into the backbones to obtain white-light emission. The influence mechanism of POSSs for hyperbranched white-emitting polymers was explored by adjusting the feeding ratios of fluorene-containing POSSs (from 1 to 20 ​mol%). The results indicated that the synthesized polymers still maintained the high thermal stabilities, and exhibited the improved amorphous film morphology and hydrophobicity, which were beneficial for obtaining optimized interface between the aqueous hole transport layer Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS) layer and polymer light-emitting layer in device fabrication. As a consequence, all of the fabricated devices with the hyperbranched polymers as light-emitting layers realized white light-emission, and the optimized device exhibite good electroluminescent (EL) performance with Commission Internationale de l’Eclairage (CIE) coordinates at (0.32, 0.33) and maximum color rendering index (CRI) of 96. The fluorene-containing POSSs modified hyperbranched copolymers with broad full width at half maximum (>284 ​nm) are attractive candidates for sunlight-style white polymer light-emitting diodes.

All-Solution-Processed Multilayered White Polymer Light-Emitting Diodes (WPLEDs) Based on Cross-Linked [Ir(4-vb-PBI)2(acac)

All-solution-processed multilayered white polymer light-emitting diodes (WPLEDs) are promising candidates for low-cost and large-area flexible full-color flat-panel displays and solid-state lighting. However, it is still challenging to improve their performance. In this work, based on an elegant strategy of orthogonal materials, the utilization of the cross-linked Ir3+ polymer film poly(NVK-co-[Ir(4-vb-PBI)2(acac)]-co-NVK) (NVK = N-vinyl-carbazole; 4-vb-HPBI = 1-(4-vinylbenzyl)-2-phenyl-1H-benzo[d]imidazole; and Hacac = acetylacetone) as the emitting layer (EML) between a hydrophilic polymer film poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the hole injection layer (HIL) and a hydrophobic polymer film poly(vinyl-PBD) (vinyl-PBD = 2-(4-(tert-butyl)phenyl)-5-(4'-vinyl-[1,1'-biphenyl]-4-yl)-2,5-dihydro-1,3,4-oxadiazole) as the electron transport layer (ETL) led to the successful fabrication of reliable all-solution-processed multilayered WPLEDs. The device exhibits a ηCEMax of 18.19 cd/A, a ηPEMax of 8.16 lm/W, and a ηEQEMax of 9.32% with stable white light (Commission International De L'Eclairage (CIE) coordinates x = 0.269-0.283, y = 0.317-0.330; corrected color temperatures (CCTs) of 7237-8199 K, and CRIs (color rendering indices) of 63-72) under a wide applied-voltage range. Its high performance, especially with record efficiencies among those of reported all-solution-processed WPLEDs, renders cross-linked Ir3+ polymers a new platform to all-solution-processed multilayered WPLEDs.

Ternary complex [Sm(acac)3(5-Br-2,2′-bpy)] for the solution-processed white polymer light-emitting diode (WPLED)

In consideration of the Sm3+-centered characteristic orange-light as the ideal color-primary component toward a dichromatic white-light, herein, through the doping of the complex [Sm(acac)3(5-Br-2,2′-bpy)] (2; Hacac = acetylacetone; 5-Br-2,2′-bpy = 5-Br-2,2′-bipyridine) into the PVK (PVK = poly(N-vinyl-carbazole)) host, the obtained PVK@2 film (10:1, wt/wt) exhibits the straightforward solid-state white-light (ΦPL = 6.7%). Further using the PVK@2 film (10:1; wt/wt) as the emitting layer, its single-component solution-processed WPLED gives the electroluminescent performance (LMax of 360.9 cd/m2, ηcMax of 1.08 cd/A) satisfactory enough for portable full-color flat displays.

Active and Deformable Organic Electronic Devices based on Conductive Shape Memory Polyimide

Smart, deformable, and transparent electrodes are a significant part of flexible optoelectronic devices. In this work, a novel approach to making highly transparent, smooth, and conductive shape memory polyimide hybrids has been proposed. Colorless shape memory polyimide (CSMPI) with high optical transparency and high heat resistance is served as the substrate for flexible electronic devices for the first time. A hybrid (Au/Ag) metal grid electrode embedded in CSMPI (BMG/CSMPI) is first fabricated via self-cracking template and solution-coating, the advantages of which include ultrasmooth surface, superior mechanical flexibility and durability, strong surface adhesion, and excellent chemical stability due to the unique embedded hybrid structure. The resulting white polymer light emitting diodes (WPLEDs) based on BMG/CSMPI with shape memory effect are active and deformable, and are converted from 2D device into 3D devices depending on its variable stiffness characteristics. The deformed 3D devices could actively recover to the original shape upon heating. Furthermore, ultrathin and flexible 3D optoelectronic devices fabricated using shape memory polymers can promote the development of advanced optoelectronic applications in the future.

Efficient, stable and high color rendering index white polymer light-emitting diodes by restraining the electron trapping

Abstract Superior solid-state light source should possess not only a high device efficiency but also high color rendering index (CRI) and excellent color stability. Here, we obtained efficient, stable and high CRI white polymer light-emitting diodes (WPLEDs) through applying the well-chosen trichromatic polymers and restraining the electron trapping. The trichromatic polymers all possess the similar mainchain units, their EL spectra shows an equidistant distribution. Detailed studies revealed that the part of green and red emission in the WPLED derive from the electron trapping which led to the current-dependent spectra. Applied proper electron transporting layer can enhance the direct electron injection which resulted in the electron trapping being restrained and improving the color stability. The optimized WPLED got a LEmax of 10.17 cd A−1 and CRI of 92, the CIE coordinates (0.346, 0.345) almost keep the same with the operating current density increasing from 10.53 mA cm−2 to 263.16 mA cm−2.

Single-component white polymer light-emitting diode (WPLED) based on a binary tris-pyrazolonate-Sm-complex

Based on the doping of the binary tris-pyrazolate-Sm3+ complex [Sm(tba-PMP)3(5-Br-2,2′-bpy)] (1; 5-Br-2,2′-bpy = 5-bromo-2,2′-bipyridine and Htba-PMP = 1-phenyl-3-methyl-4-(tert-butylacetyl)-5-pyrazolone)) with an efficient orange-light into the PVK (poly(N-vinylcarbazole) host, the obtained PVK@1 films exhibit the dichromatic color-tuning (white-light to purplish-pink and to pink) characters strictly relative to the Sm3+-doping content and the λex wavelength. Further using the PVK@1 film (10:1; wt/wt) with the straightforward white-light (ΦPL = 5.8%) as the emitting layer, its single-component solution-processed WPLED gives the electroluminescent performance (LMax of 157 cd/m2, ηcMax of 0.65 cd/A and the white-light-emitting stability) satisfactory enough for portable full-color flat displays.

Efficient white polymer light-emitting diodes (WPLEDs) based on covalent-grafting of [Zn2(MP)3(OAc)] into PVK.

Thanks to the straightforward white light of single grafting-type polymers based on earth-abundant Zn(ii)-complexes, producing cost-effective flexible WOLEDs/WPLEDs with good device performance remains a formidable challenge. Herein, by using the polymer Poly(NVK-co-[Zn2(MP)3(OAc)]) with excellent physical properties for single-layer WPLEDs, record-high efficiencies (ηMaxc = 13.0 cd A−1, ηMaxp = 6.1 lm W−1 and ηMaxEQE = 9.2%) and low (ca. 25%) efficiency roll-off compared to previous organo-Zn2+-based WOLEDs/WPLEDs are realized. This finding renders single Zn(ii)-complex-grafted polymers a new route to low-cost and large-area flexible WPLEDs for potential full-colour flat displays.

Pyrene-based hyperbranched porous polymers with doped Ir(piq)2(acac) red emitter for highly efficient white polymer light-emitting diodes

Here, we designed and prepared a series of hyperbranched porous polymers constructed using fluorene branches and pyrene core, and all hyperbranched porous polymers exhibit intense blue fluorescence, good morphological stability, and high thermal stability. Further, it is found that the aperture sizes for hyperbranched porous polymers can be adjusted by simply changing the content of pyrene and fluorene in the synthesis process. When the feed ratios of pyrene in the total polymers is 15 mol%, the optimized aperture size was obtained, which is slightly larger than the maxlength of complementary red emitter Bis(1-phenylisoquinoline)(acetylacetonate)iridium (III) (Ir(piq)2acac), indicating the Ir(piq)2acac can well distributed in the apertures of hyperbranched porous polymers in co-doped film of Ir(piq)2acac and hyperbranched porous polymers. The fabricated polymer-light-emitting diode (PLED) with such co-doped film as light-emitting layer realizes good white emission with almost equal blue and red emission intensity from hyperbranched porous polymers and Ir(piq)2acac. The balanced electroluminescent (EL) spectra contribute to ideal Commission Internationale de l’Eclairage (CIE) coordinate of (0.326, 0.374) located at white light zone. In addition, the device also achieves high device performance with maximum luminance and current efficiency reaching 5369 cd/m2 and 8.35 cd/A, respectively. We believe that such porous-structure polymers have huge potential applications in the development of highly efficient white PLEDs with reducing production cost.

Efficient White Polymer Light‐Emitting Diode (WPLED) Based on Single‐Component Eu3+–Tb3+‐Containing Metallopolymer

AbstractDespite the excellent physical properties of single‐component Eu3+–Tb3+‐containing metallopolymers, the development of their flexible white polymer light‐emitting diodes (WPLEDs) for portable full‐color flat displays remains a formidable challenge. Herein, the WPLEDs from a metallopolymer Poly(NVK‐co‐2‐co‐7) are reported, in which [Eu(DBM)3(4‐vp‐PBI)] (2) and [Tb(tba‐PMP)3(4‐vp‐PBI)] (7) with different localized circumstances are grafted into poly(N‐vinyl‐carbarzole) (PVK). In this design, both Dexter and Förster energy transfers occur, which endow a photoluminescent quantum yield up to 22.3% of the straightforward high‐quality white‐lights. Contributing from the stepwise alignment of frontier molecular orbitals of Poly(NVK‐co‐2‐co‐7) as the emitting layer in combination with CBP‐ and BCP‐assisted carrier‐transports, a reliable WPLED with the record‐renewed electroluminescent performance (LMax = 388.0 cd m−2, ηcMax = 31.1 cd A−1, ηpMax = 15.0 lm W−1, ηEQEMax = 18.1%, and weak efficiency‐roll‐off) among previous organo‐Ln3+‐based white organic light‐emitting diodes/WPLEDs is achieved. This finding renders a single‐component Eu3+–Tb3+‐containing metallopolymers a potential new platform to cost‐effective flexible WPLEDs for practical applications.

Efficient white polymer light-emitting diodes (WPLEDs) based on double emitting layers of a PVK:Eu(iii)-complex and Alq3

Elaborated from the dEML-configured structure for WPLEDs with low turn-on voltage (6.0–7.5 V) and weak efficiency-roll-off, their efficiencies (ηc = 0.32–0.39 cd A−1, ηEQE = 0.54–0.56% and ηp = 0.99–1.10 lm W−1) represent the record values of organo-Eu3+-incorporated WPLEDs.

White polymer light-emitting diodes with ultra-large color shifts for pulse-width-modulation applications

By using a commercially available pulse-width-modulation driver, the white light emitting diodes with independently tunable CIE coordinates and luminance were realized, which exhibited great potential toward practical applications.

Synthesis and properties of hyperbranched polymers for polymer light emitting devices with sunlight-style white emission.

A new series of hyperbranched polymers consisting of fluorene-alt-carbazole as the branches and the three-dimensional-structured spiro[3.3]heptane-2,6-dispirofluorene (SDF) as the core were designed and synthesized by one-pot Suzuki coupling polycondensation. A phosphor group with broad full width at half maximum (FWHM) bis(1-phenyl-isoquinoline)(acetylacetonato)iridium(iii) (Ir(Brpiq)2acac, 0.08 mol%) as the red-light emitting unit and bis(2-(4-bromophenyl)-1-[6-(9-carbazolyl)hexyl]-imidazole)(2-(5-(4-fluorinated phenyl)-1,3,4-triazole)pyridine)iridium(iii) ((CzhBrPI)2Ir(fpptz)) as the green-light emitting unit were introduced into the backbones to obtain sunlight-style white-light emission by adjusting the feeding ratios of (CzhBrPI)2Ir(fpptz) (0.08 to 0.32 mol%). The results indicate the synthesized polymers show high thermal stabilities and good amorphous film morphology because of the hyperbranched structures. Besides, the lowest unoccupied molecular orbital (LUMO) levels of polymers were reduced and the electron injection was improved because of excellent electron-transporting ability of the triazole unit in the green group. The hyperbranched structures can effectively suppress the polymers' chain distortion and aggregation, and promote the incomplete Förster resonance energy transfer (FRET) efficiency from fluorene-alt-carbazole segments to Ir complex units. As a result, the devices with hyperbranched polymer light-emitting layers realize white light emission, and the optimized device also exhibits good electroluminescent (EL) performance with Commission Internationale de l'Eclairage (CIE) coordinates at (0.32, 0.31), a maximum luminance of 9054 cd m−2, a maximum current efficiency of 3.59 cd A−1 and a maximum Color Rendering Index (CRI) of 91. The hyperbranched polymers based on fluorene-alt-carbazole branches and a SDF core and high-efficiency phosphor groups with broad full width at half maximum are attractive candidates for sunlight-style white polymer light-emitting device.

Synthesis and properties of hyperbranched polymers for white polymer light-emitting diodes.

In this work, a series of hyperbranched copolymers with fluorene-alt-carbazole as the branches, three-dimensional-structured spiro[3.3]heptane-2,6-dispirofluorene (SDF) as the core, and iridium 1-(4-bromophenyl)-isoquinoline (acetylacetone) (Ir(Brpiq)2acac) as the dimming group were synthesized by one-pot Suzuki polycondensation for white emission. All copolymers show great thermal stabilities and high hole-transporting ability due to the introduction of the carbazole unit. The hyperbranched structures for copolymers can suppress the interchain interactions efficiently, and help to form amorphous films. The fabricated polymer light-emitting devices (PLEDs) based on the above synthesized copolymers realize good white light emission, and achieve high electroluminescence (EL) performance. For example, for the optimized PLED, the maximum luminance and current efficiency reach 6210 cd m−2 and 6.30 cd A−1, respectively, indicating the synthesized hyperbranched copolymers have potential application in solution-processable white polymer light-emitting diodes.

Novel dinuclear cyclometalated Platinum(II) complex as orange phosphorescent emitters for single-emitting-layer white polymer light-emitting diodes

Novel binuclear platinum complex (FPT)2Pt2(diPic) and mononuclear platinum complex (FPT)Pt(Pic) were designed and synthesized, where FPT is N-(4-(6-(9,9-diethyl-9H-fluoren-2-yl)pyridin-3-yl)phenyl)N-phenylbenzenamine, diPic is 3-(6-(2-carboxypyridin-3-yloxy)hexyloxy)picolinic acid, and Pic is picolinic acid. The photophysical, electrochemical and thermal properties, as well as electroluminescent (EL) properties for both platinum(II) complexes were studied. Compared to (FPT)Pt(Pic), (FPT)2Pt2(diPic) exhibited stronger phosphorescent emission in PL spectra and higher ΦPL, owing to the enhanced spin-orbit interaction of platinum centers. Moreover, the monochromatic devices based on (FPT)2Pt2(diPic) showed better EL properties than (FPT)Pt(Pic). Based on that, the single-emissive-layer WPLEDs using (FPT)2Pt2(diPic) as orange emitter and FIrpic as blue emitter were also obtained. The WPLEDs show best performances with a maximal LE of 1.3 cd/A, and a CIE coordinates of (0.35, 0.37) which is very close to the pure white emission. Work is still underway to improve the device efficiency and color purity of these iridium and platinum complexes co-doped WPLEDs.

White polymer light-emitting diodes based on dibenzo-24-crown-8 decorated orange-emitting iridium complexes

Two orange phosphorescent iridium complexes decorated by dibenzo-24-crown-8 unit as the dopants were used into polymer light-emitting diodes (PLEDs) with a configuration of ITO/PEDOT:PSS/emission layer (EML)/CsF/Al. Monochromic orange-emitting PLEDs using complex 2 as dopant and poly(N-vinylcarbazole) (PVK) as host exhibit best device performance with a peak luminous efficiency (LE) of 8.94 cd/A at a current density of 1.3 mA/cm2 and a Commission Internationale de L'Eclairage (CIE) coordinate of (0.52, 0.41). More importantly, several white polymer light-emitting diodes (WPLEDs) were also fabricated with the skyblue–orange dual emitters system. The WPLEDs combination of the orange phosphor complex 2 with skyblue phosphor iridium(III)bis(2-(4,6-difluorophenyl)-pyridinato-N,C2′)picolinate (FIrpic) in a single-emissive-layer exhibit best electroluminescent performances with a maximal LE of 5.12 cd/A at a current density of 2.63 mA/cm2, a turn on voltage of 6.5 V and a CIE coordinates of (0.33, 0.39), which is very close to the ideal CIE coordinate of (0.33, 0.33) for pure white color.

Investigation of Energy Transfer in Star-Shaped White Polymer Light-Emitting Devices via the Time-Resolved Photoluminescence.

A series of white polymer light-emitting devices (WPLEDs) were fabricated by utilizing star-shaped white-emission copolymers containing tri[1-phenylisoquinolinato-C2,N]iridium (Ir(piq)3), fluorenone (FO) and poly(9,9-dioctylfluorene) (PFO) as red-, green- and blue-emitting (RGB) components, respectively. In these WPLEDs, a maximum current efficiency of 6.4 cd·A−1 at 20 mA·cm−2 and Commission Internationale d’Eclairage (CIE) coordinates of (0.33, 0.32) were achieved, and the current efficiency was still kept to 4.2 cd·A−1 at the current density of 200 mA·cm−2. To investigate energy transfer processes among the three different chromophores of the star-shaped copolymers in these WPLEDs, the time-resolved photoluminescence (PL) spectra were recorded. By comparing the fluorescence decay lifetimes of PFO chromophores in the four star-like white-emitting copolymers, the efficient energy transfer from PFO units to Ir(piq)3 and FO chromophores was confirmed. From time-resolved PL and the analysis of energy transfer process, the results as follows were proved. Owing to the star-like molecular structure and steric hindrance effect, intermolecular interactions and concentrations quenching in the electroluminescence (EL) process could also be sufficiently suppressed. The efficient energy transfer also reduced intermolecular interactions’ contribution to the enhanced device performances compared to the linear single-polymer white-light systems. Moreover, saturated stable white emission results from the joint of energy transfer and trap-assisted recombination. This improved performance is expected to provide the star-like white-emitting copolymers with promising applications for WPLEDs.

Novel yellow phosphorescent iridium complexes with dibenzothiophene-S,S-dioxide-based cyclometalated ligand for white polymer light-emitting diodes

We have designed and synthesized two novel yellow phosphorescent iridium complexes using dibenzothiophene-S,S-dioxide-based cyclometalated ligand for the first time, which are capable of producing highly efficient yellow and white polymer light-emitting devices (PLEDs). The resulted iridium complexes display good thermal stability and high photoluminescence quantum yields. Both yellow and white PLEDs are fabricated with an identical single-emission-layer configuration of ITO/PEDOT:PSS/emission layer (EML)/CsF/Al. For the yellow phosphorescent PLEDs based on (p-CzFSOPy)2IrPic, the best device performances with a peak luminous efficiency (LE) of 13.3 cd/A and a peak external quantum efficiency (EQE) of 5.3% are achieved. More importantly, the two-element WPLEDs containing iridium (III)bis (2-(4,6-difluorophenyl)-pyridinato-N,C2′) picolinate (FIrpic) as blue and (p-CzFSOPy)2IrPic as yellow phosphors doped into a PVK:OXD-7 matrix at an appropriate ratio exhibited a maximum LE of 19.2 cd/A, a maximum EQE of 9.6%, an extremely high luminance of 18717 cd/m2 and Commission Internationale de L'Eclairage (CIE) coordinate of (0.317, 0.448). Moreover, at a luminance for practical application of 1000 cd/m2, the LE still remains as high as 19.0 cd/A, with a very slight decrease.

P‐13.1: Tuning Color‐Correlated Temperature and Color Rendering Index of Phosphorescent White Polymer Light‐emitting Diodes: Towards Healthy Solid‐state Lighting

We report on efficient solution‐processed phosphorescent white polymer light‐emitting diodes (WPLEDs) with tunable color‐correlated temperature (CCT) and color rendering index (CRI), through rationally controlling the composition of the emission layer (EML) based on a novel near‐infrared (NIR)‐emitting dinuclear cyclometalated platinum (II) complex (Pt‐1), a sky‐blue emitter iridium (III) bis[(4,6‐di‐fluorophenyl)‐pyridinato‐N,C2] (picolinate) (FIrpic), and a yellow emitter bis[2‐(thieno[3,2‐c]pyridin‐4‐yl)phenyl]iridium(III)(acetylaceton ato) (PO‐01). One of the best three‐color WPLEDs shows a CCT of 3246 K as well as an excellent high CRI of 87, which are greatly beneficial in reducing deep‐blue light damage and simultaneously meet the requirement for good color reproduction. Meanwhile, the relevant WPLED also achieves a maximum current efficiency of 12.1 cd/A, corresponding to external quantum efficiency of 10.6%. This work presents an effective approach through rational combination of sky‐blue, yellow, and NIR emitters towards high‐performance solution‐processable WPLEDs with a physiologically‐friendly CCT and a high CRI.

Color-tunable to direct white-light and application for white polymer light-emitting diode (WPLED) of organo-Eu3+- and organo-Tb3+-doping polymer

Through the doping of red-light-emitting [Eu(BA)3(5-Br-2,2′-bpy)] (2; HBA = 1-phenyl-1,3-butanedione; 5-Br-2,2′-bpy = 5-Br-2,2′-bipyridine) and blue-green-light-emitting [Tb(BA)3(5-Br-2,2′-bpy)] (3) into PMMA (poly(methyl methacrylate)), the obtained 2@3@PMMA (1[2/3 = 1:10]:200) exhibits color-tunable white-light. Moreover, using it as the guest of the emitting layer, a single-component white polymer light-emitting diode (WPLED) with good color stability and ultra-high color rendering index (CRI) of 86–92 is also realized.

Saturated and Stable White Electroluminescence from Linear Single Polymer Systems Based on Polyfluorene and Mono-Substituted Dibenzofulvene Derivatives

The development of new electroluminescent copolymer based materials for white polymer light emitting diodes (WPLED) with special emphasis on the conceptual novelty of utilizing aggregation-induced emission enhancement (AIEE) active or dual state emitting, monosubstituted dibenzofulvene (M-DBF) derivatives 4-(5-fluoren-9-ylidenemethyl-thiophen-2-yl)-7-(4-methoxy-phenyl)-benzo[1,2,5]thiadiazole (DT) or 4-[5-(4-fluoren-9-ylidenemethyl-phenyl)-thiophen-2-yl]-7-(4-methoxy-phenyl)-benzo[1,2,5]thiadiazole (DP) as orange/red fluorophores into polyfluorene (PF) main chain is demonstrated. The mol % of these M-DBF monomer based special small π-system has been optimized as low as 0.0003, 0.0006, and 0.001% in the poly[2,7-(9,9′-dioctylfluorene)-co-4-(5-fluoren-9-ylidenemethyl-thiophen-2-yl)-7-(4-methoxy-phenyl)-benzo[1,2,5]thiadiazole (WDT) and poly[2,7-(9,9′-dioctylfluorene)-co-4-[5-(4-fluoren-9-ylidenemethyl-phenyl)-thiophen-2-yl]-7-(4-methoxy-phenyl)-benzo[1,2,5] thiadiazole (WDP) copolymers, respectively. We report the utilization of “dual emission” peaks from PFO and M-DBFs in the blue and orange region that enabled the fabrication of bias-independent WPLEDs which is fundamentally very important and highly challenging in the case of linear polymers. These copolymers showed excellent solubility in organic solvents viz. CHCl3, THF, toluene, p-xylene, etc. The synthesized copolymers were characterized by UV–vis and photoluminescence (PL) spectroscopy, and WPLEDs with ITO/PEDOT:PSS/WDP or WDT/TPBi/LiF/Al configurations were fabricated to study their electroluminescence (EL) properties. Partial energy transfer has been achieved by adjusting the PFO and DT or DP concentrations in the single polymer main chain leading to the white emission in a facile manner. The copolymers WDP-1 and WDT-1 gave saturated white emission with CIE coordinates of (0.31, 0.33) and (0.35, 0.34) at 8–14 voltages and exhibiting excellent voltage independent emission. The highest luminous efficiencies of 7.82 and 4.57 cd A–1 were achieved for WDP and WDT polymers with the highest brightness values of 9753 and 7436 cd m–2, respectively.