Broadly tunable metal halide perovskites for solid-state light-emission applications

Adjokatse, Sampson; Fang, Hong‐Hua; Loi, Maria Antonietta

doi:10.1016/j.mattod.2017.03.021

Cited by 238 publications

(184 citation statements)

References 139 publications

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“…[1] They have been used to demonstrate highly efficient solar cells, [2,3] light-emitting diodes, [4,5] and gas sensors. [1] They have been used to demonstrate highly efficient solar cells, [2,3] light-emitting diodes, [4,5] and gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Fang

Yang

Adjokatse

et al. 2019

Adv Funct Materials

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118

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2D perovskite materials have recently reattracted intense research interest for applications in photovoltaics and optoelectronics. As a consequence of the dielectric and quantum confinement effect, they show strongly bound and stable excitons at room temperature. Here, the band-edge exciton fine structure and in particular its exciton and biexciton dynamics in high quality crystals of (PEA) 2 PbI 4 are investigated. A comparison of bulk and surface exciton lifetimes yields a room temperature surface recombination velocity of 2 × 10 3 cm s −1 and an intrinsic lifetime of 185 ns. Biexciton emission is evidenced at room temperature, with a binding energy of ≈45 meV and a lifetime of 80 ps. At low temperature, exciton state splitting is observed, which is caused by the electron-hole exchange interaction. Transient photoluminescence resolves the low-lying dark exciton state, with a bright/dark splitting energy estimated to be 10 meV. This work contributes to the understanding of the complex scenario of the elementary photoexcitations in 2D perovskites. materials such as transition metal dichalcogenides, phosphorene, and graphene. They can be easily grown by both solution methods and vapor transport methods at low temperature, [14][15][16][17] with a tunable bulk direct bandgap. [18] These advantages make them appealing for future optoelectronic and photonic applications.Unlike their 3D counterparts, the dielectric and quantum confinement of carriers in the 2D perovskite layers gives rise to unusually strong excitonic effects. [19,20] It has been experimentally observed that excitons are tightly confined in the inorganic layers with binding energy as high as a few hundred millielectronvolts (significantly higher than that of 3D perovskites). [21] This greatly enhanced exciton binding energy makes them particularly interesting for light-emitting applications. [8,22] Moreover, 2D perovskites can exhibit a variety of multiexciton species, including biexcitons and trions. [20,23,24] The presence of these quasiparticles is exciting due to their unique role, leading to a better understanding of many body effects and their great promise for photonic applications. In addition, recent experiments reveal an important role of electron-phonon couplings on the exciton dynamics in 2D lead-iodide perovskite, suggesting a complex scenario for carrier relaxation and exciton formation. [25,26] It is therefore crucial to understand elementary photoexcitations in these layered materials. However, exciton fine structures and their properties are usually masked by local energy fluctuations resulting from disorder in thin films or broad emission due to the formation of self-trapped excitons. [27] Whereas their steady-state optical properties have

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Section: Introductionmentioning

confidence: 99%

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Fang

Yang

Adjokatse

et al. 2019

Adv Funct Materials

Self Cite

118

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“…Metal hybrid perovskites are being studied for applications including photovoltaics, photodiodes, and light‐emitting diodes (LEDs) due to their tunable optoelectrical properties . This tunability comes about because of the wide selection of corresponding chemical precursors and the potential for quantum confinement via controlled dimensionality .…”

Section: Introductionmentioning

confidence: 99%

Controlling Spatial Crystallization Uniformity and Phase Orientation of Quasi‐2D Perovskite‐Based Light‐Emitting Diodes Using Lewis Bases

Han

Park

Wang

et al. 2019

Adv Materials Inter

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Crystallographic orientation has a significant impact on the optoelectronic properties of films of quasi‐2D perovskite quantum wells. Here, oxygen‐bearing Lewis bases are employed as additives to explore their ability to modulate spatial uniformity of crystallization and orientation of crystal phases. Different Lewis bases added into the precursor solutions incorporating the large organic ammonium cation, phenethylammonium (PEA+), lead to different crystallization kinetics, which are attributed to the varying stability of intermediate complexes. The microscopic photoluminescence heterogeneity and 2D X‐ray diffraction patterns of the thin films reveal that inclusion of Lewis bases can lead to spatially more uniform crystallization and random orientation, resulting in an enhancement in light‐emitting diode performance. In contrast, quasi‐2D phases formed without Lewis bases show poorer uniformity and preferentially vertical orientation. Comparing the Lewis base properties such as Mayer order unsaturation and polarizability suggests that the ability to weakly coordinate with lead and strongly interact with the large organic ammonium is a key factor in controlling the phase composition favorably toward highly luminescent light‐emitting diodes. This work may be of help to provide insight of what kinds of Lewis bases can be helpful to realize the desired phase composition for high performance of optoelectronic applications.

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“…In 2018, Cao et al and Lin et al reported perovskite LEDs with EQE exceeding 20%, respectively, which represents a substantial step toward the practical application of perovskite LEDs. Recently, there have been excellent review papers on perovskite materials spanning their fundamental photophysical properties, structure engineering, and optoelectronic device development . The next frontier in perovskite research is set to revolutionize the field of photonic incoherent/coherent sources and optoelectronic devices by use of the material enhancement including materials design, exciton engineering, and emission tunability.…”

Section: Introductionmentioning

confidence: 99%

Tunable Halide Perovskites for Miniaturized Solid‐State Laser Applications

Liao

Jin

2019

Advanced Optical Materials

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Halide perovskites have shown great potential in optoelectronic applications, such as a record photovoltaic efficiency of 23.3%, and an achievement of external quantum efficiency beyond 20% in perovskite light‐emitting diodes, as well as other promising demonstrations of light‐emitting transistors and photodetectors. Moreover, the extraordinary optoelectronic properties of optical absorption, high photoluminescence quantum yield, low non‐radiative recombination rates, large and balanced charge‐carrier mobilities, and high gain coefficients extend their applications into the coherent light sources (laser) field. However, although halide perovskites have made great progress, the realization of solid‐state electrically pumped lasers has not been achieved yet. This review starts with a discussion of the structure, optical properties, and gain behaviors of various perovskite materials. Then, the rapid advances of perovskite‐based laser applications are reviewed, in which they are mainly classified into three sections: optically pumping lasers, strong‐coupling lasers, and continuous‐wave pumped lasers. Finally, the conclusions and some remaining challenges for perovskite electrically driven lasers are highlighted.

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Broadly tunable metal halide perovskites for solid-state light-emission applications

Cited by 238 publications

References 139 publications

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Controlling Spatial Crystallization Uniformity and Phase Orientation of Quasi‐2D Perovskite‐Based Light‐Emitting Diodes Using Lewis Bases

Tunable Halide Perovskites for Miniaturized Solid‐State Laser Applications

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