Green‐Light‐Emitting Diodes based on Tetrabromide Manganese(II) Complex through Solution Process

Xu, Liang‐Jin; Sun, Cheng-Zhe; Xiao, Hui; Wu, Yue; Chen, Xiaoming

doi:10.1002/adma.201605739

Cited by 203 publications

(181 citation statements)

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“…With the same organic cation, a green emitting 0D hybrid containing tetrahedral MnBr 4 species was developed by Xu et al, which was used as solution processable emitter in OLEDs. (Figure 8(h,i)) [134]. The strongly Stokes-shifted emission with microsecond lifetime suggests its origin from spin-forbidden d-d 4 T 1 → 6 A 1 transition of the Mn ions in d 5 configuration with a tetrahedral coordination geometry.…”

Section: D Metal Halide Hybridsmentioning

confidence: 87%

Organic–inorganic metal halide hybrids beyond perovskites

Zhou

Lin

Lee

et al. 2018

Materials Research Letters

118

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Organic-inorganic metal halide hybrids have emerged as new generation functional materials with exceptional structure and property tunability for a variety of applications. Besides the most investigated ABX 3 metal halide perovskites, a variety of hybrids consisting of a wide range of organic cations and metal halide anions have been developed and studied recently. Here, we provide an overview of these new materials possessing various crystallographic structures, including double perovskites, low dimensional hybrids, and other perovskite-related materials. We discuss their syntheses, functional properties, and optoelectronic applications. Challenges and opportunities are then laid out for these hybrid materials beyond perovskites. IMPACT STATEMENTBy choosing appropriate organic cations and metal halide anions, single crystalline ionically bonded hybrid materials can be assembled to possess various structures beyond the well-known ABX 3 perovskite. These hybrid materials exhibit exciting new properties with potential applications in a variety of areas. ARTICLE HISTORY

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Section: D Metal Halide Hybridsmentioning

confidence: 87%

Organic–inorganic metal halide hybrids beyond perovskites

Zhou

Lin

Lee

et al. 2018

Materials Research Letters

118

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“…Attributed to their excellent solid‐state photophysical properties, this kind of organic–inorganic hybrid complexes have exhibited promising optoelectronic applications. For example, Chen and co‐workers have realized the solution‐processed PhOLEDs based on the ionic tetrabromide manganese(II) complex ((Ph 4 P) 2 (MnBr 4 )) as an emitting dopant, the external quantum efficiency (EQE) of this device can reach 9.6% for the doped OLEDs . However, the ionic manganese(II) complexes often suffer from low stability and can be easily hydrolyzed in air.…”

Section: Key Performance Of the Devices A–cmentioning

confidence: 99%

Designing Highly Efficient Phosphorescent Neutral Tetrahedral Manganese(II) Complexes for Organic Light‐Emitting Diodes

Qin

Tao

Gao

et al. 2018

Advanced Optical Materials

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coupling effect induced by heavy-metal atoms. [5,6] For example, noble metal-based phosphors including iridium(III) complexes, [7][8][9][10][11][12][13][14][15][16] platinum(II) complexes, [17][18][19][20] and gold(III) complexes [21,22] have been widely used in phosphorescent OLEDs (PhOLEDs). However, these noble metals suffer from the low abundance and high cost. Hence, the relatively abundant, lowcost, and low-toxic phosphorescent metal complex have been drawing great interests for PhOLEDs.Recent explorations of phosphorescent manganese(II) complexes appear to be a new and attractive alternative toward highly efficient PhOLEDs. The manganese(II) complexes display strong photoluminescence in solid state originating from the metal-centered d-d ( 4 T 1 (G) → 6 A 1 ) radiative transition. [23][24][25] The well-known green light-emitting manganese(II) complexes are ionic compounds consisting of organic cations and inorganic tetrahalogenomanganate(II) anions. [26,27] Attributed to their excellent solid-state photophysical properties, this kind of organic-inorganic hybrid complexes have exhibited promising optoelectronic applications. For example, Chen and co-workers have realized the solution-processed PhOLEDs based on the ionic tetrabromide manganese(II) complex ((Ph 4 P) 2 (MnBr 4 )) as an emitting dopant, the external quantum efficiency (EQE) of this device can reach 9.6% for the doped OLEDs. [28] However, the ionic manganese(II) complexes often suffer from low stability and can be easily hydrolyzed Phosphorescent transition-metal complexes have played the vital role in the rapid development of organic light-emitting diodes (OLEDs) as the most promising candidates for next-generation flat-panel display and solid-state lighting techniques. In this work, novel and low-cost phosphorescent neutral tetrahedral manganese(II) complexes (DBFDPO-MnX 2 , X = Br, or Cl) based on dibenzofuran-based phosphine oxide derivative as ligand are designed and synthesized. The manganese(II) complexes exhibit intense green phosphorescence with high photoluminescence quantum yields (PLQYs) of as high as 81.4% (DBFDPO-MnBr 2 ). Using complex DBFDPO-MnBr 2 as dopant, a green OLED with current efficiency (CE max ) of 35.47 cd A −1 , power efficiency (PE max ) of 34.35 lm W −1 , and external quantum efficiency (EQE max ) of 10.49% is fabricated. Interestingly, red exciplex emission is also observed in electroluminescence, arising from the interaction between the host materials (bis(2-(2-hydroxyphenyl)-pyridine)beryllium (Bepp 2 ) or 1,3,5-tris(2-N-phenylbenzimidazolyl)benzene (TPBi)) and the dopant (DBFDPO-MnBr 2 ).The exciplex-based red OLED in this study exhibits the maximum CE and PE reaching 18.64 cd A −1 and 17.92 lm W −1 , respectively, which are among the up-to-date highest values for exciplex-based red OLEDs. Beneficial from the exciplex, it has the great potential to broaden the electroluminescent spectra with manganese(II) complex. Phosphorescent OLEDsThe ORCID identification number(s) for the author(s) of this article can be fou...

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“…Interestingly, two PL peaks (a stronger PL emission centered at about 672 nm and a weaker emission at 550 nm) are unexpectedly detected (Figure b). Normally, a characteristic green emission is detected for tetrahedral [MnX 4 ] 2− (X=Cl, Br, I) species, but a broad emission with large Stokes shift is rarely reported for these complexes. Low‐dimensional organic metal halides have been developed as white‐light‐emitting diodes, attributed to their broadband emission with large Stokes shift, resulting from STEs formation upon excitation .…”

Section: Figurementioning

confidence: 99%

Exploring Organic Metal Halides with Reversible Temperature‐Responsive Dual‐Emissive Photoluminescence

et al. 2019

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The exceptional structural tunability of organic metal halides endows them with fascinating electronic and photophysical properties, providing much scope for applications.I nt his work, single crystalso ft he organic metal halide (C 4 H 9 NH 3 ) 2 MnI 4 are found to show reversible thermo-induced luminescent chromism within aw ide temperature range.T he (C 4 H 9 NH 3 ) 2 MnI 4 single crystal exhibits two emission peaks at 550 and 672 nm, which are assigned to ad -d transition of Mn 2 + -centered tetrahedra and self-trapped excitons, respectively.T he temperature-dependent emission color change is attributed to the thermo-induced trapping and detrapping process of the self-trapped exciton. (C 4 H 9 NH 3 ) 2 MnI 4 exhibits am aximum photoluminescence quantum efficiency of up to 68 %a t 70 8C. The disclosed interacted photoluminescence decay mechanisms may prove useful for the further designo fo rganic metal halidesfor optical thermometry.

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Green‐Light‐Emitting Diodes based on Tetrabromide Manganese(II) Complex through Solution Process

Cited by 203 publications

References 43 publications

Organic–inorganic metal halide hybrids beyond perovskites

Organic–inorganic metal halide hybrids beyond perovskites

Designing Highly Efficient Phosphorescent Neutral Tetrahedral Manganese(II) Complexes for Organic Light‐Emitting Diodes

Exploring Organic Metal Halides with Reversible Temperature‐Responsive Dual‐Emissive Photoluminescence

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