PT Crystals Research Articles

Nanoscale investigation on electric field induced ferroelectric phase transitions in the rhombohedral PMN-PT single crystal

The excellent piezoelectric property of Pb(Mg1/3Nb2/3)O3-PbTiO3(PMN-PT) single crystals has attracted increasing attentions for their application in electromechanical devices. Generally, the electric field induced phase transition is an important contribution to the piezoelectric response. Understanding the pathway of electric field induced phase transition is essential for the practical application of PMN-PT crystals. Here, evolution of the domain structure and surface screening charges during phase transitions in the (001) oriented 0.72PMN-0.28PT crystal were studied at nanoscale via piezo-response force microscopy (PFM) and Kelvin probe force microscopy (KPFM). In combination with confocal polarized Raman spectroscopy, electric field induced phase transitions were locally studied. PFM tip bias poling in 0.72PMN-0.28PT single crystal results in a rhombohedral to monoclinic phase transition. And the monoclinic phase relaxes back to the rhombohedral at elevated temperatures. Our work provides nanoscale investigations on the electric field induced phase transition, and will be instructive for the practical application of PMN-PT single crystals.

Favorable dynamics of switching and non-switching polarizations in ⟨001⟩pc oriented Sm:PMN-PT crystal

In this investigation, the dynamic behavior of the switching and the non-switching polarization loops has been studied for ⟨001⟩pc oriented PMN-PT and Sm:PMN-PT crystals. A five-pulse triangular wave sequence was employed to measure the switching and non-switching polarization loops separately as a function of amplitude and frequency of the poling field. Dynamic scaling of the switching loops was performed according to the power law <ASW>∝ Eαfβ. The lower negative value of β for Sm:PMN-PT suggests a shorter response time of crystallographic domains for it as compared to that for PMN-PT. The value of exponent α for PMN-PT was found to be higher in the low-field regime where 180° switching dominates the domain reorientation process. For Sm:PMN-PT, on the other hand, the value of α was found to be higher at high fields, which implies a superior ferroelastic domain reorientation. A similar power law scaling was also performed on the non-switching loops, which suggests a faster dynamic response of intrinsic polarization in Sm:PMN-PT as compared to that for PMN-PT. However, the intrinsic polarization in Sm:PMN-PT was found to be less responsive to the increasing field as compared to that for PMN-PT. We believe that the findings of this investigation would add another dimension to the understanding of the mechanism responsible for the high piezoelectric activity in samarium doped PMN-0.28PT crystal and polycrystalline ceramics.

Scaling relations of domain reversal dynamics in rhombohedral and tetragonal PIN–PMN–PT ferroelectric single crystals

The domain reversal dynamics of rhombohedral and tetragonal PIN–PMN–PT ferroelectric single crystals has been investigated by analyzing the variation of hysteresis loops under various electric fields and frequencies. As the electric field amplitude E0 continuously increases, the hysteresis area ⟨A⟩ clearly reflects three stages of polarization reversal. The complete scaling relations of domain reversal dynamics were determined. For rhombohedral PIN–47PMN–29PT crystals, the dynamic hysteresis area follows the law of ⟨A⟩ ∝ f −0.38816E05.21244 in the first E0-stage and ⟨A⟩ ∝ f 0.03553E00.37126 in the third E0-stage. For tetragonal PIN–37PMN–39PT crystals, the dynamic hysteresis area follows the law of ⟨A⟩ ∝ f −0.09054E02.74854 in the first E0-stage and ⟨A⟩ ∝ f −0.15504E02.06936 in the third E0-stage. The negative α indicates that with the alternating velocity of the increasing periodic electric field, more and more domain reversals fail to follow with the alternating electric field. However, rhombohedral PIN–47PMN–29PT crystals possess a positive α in the third E0-stage, indicating that 71° and 109° domains can keep pace with varying E0 more easily. The positive β indicates that when the electric field frequency is fixed, more and more domains begin to reverse with the intensity of the increasing electric field. In addition, the function of ⟨A⟩ ∝ f αE0β cannot be applied to the second E0-stage, where the non-180° domain rotation starts occurring but 180° domain rotation has not finished yet.

Reporting Excellent Transverse Piezoelectric and Electro‐Optic Effects in Transparent Rhombohedral PMN‐PT Single Crystal by Engineered Domains

Transparent ferroelectric crystals with high piezoelectricity are challenging to build because of their complex structure and disordered domains in rhombohedral relaxor ferroelectrics. There are eight domains along the <111> direction, which cause light scattering. In this study, perfect transparency is achieved along the [110] and [001] directions in [110]-poled rhombohedral 0.72Pb(Mg1/3 Nb2/3 )O3 -0.28PbTiO3 (PMN-PT) crystals, which have a high d31 value of 1700 pC N-1 and a high electro-optic coefficient γ33 of 320 pm V-1 . This implies that the [110]-oriented rhombohedral PMN-0.28PT crystal can realize the mode of transverse modulation, whereas the [001]-oriented PMN-0.28PT crystal is more suitable for the longitudinal mode. Through piezoresponse force microscopy (PFM), it is confirmed that the [110]-poled rhombohedral PMN-PT crystals form 71° layered domains, which are similar to the 109° layered domains of the [001]-oriented transparent crystal. Combined with PFM and birefringence microscopy, the degradation of domains and thickness dependence of piezoelectricity provide clear evidence for the relationship between the engineered domain structures and piezoelectric properties, which should be considered in the design of piezoelectric or electro-optic devices with excellent performance. This work enriches the research on ferroelectric domain engineering for excellent transparency and high piezoelectricity to provide new ideas for photoacoustic devices.

Hydrogen Evolution/Oxidation Electrocatalysts by the Self-Activation of Amorphous Platinum.

Amorphous nanostructures usually exhibit special and intriguing catalytic activities, and the electrochemical performance can be tuned during operation. Herein, a facile approach of the self-activation of amorphous platinum (A-Pt) nanospheres has been applied to develop a durable and efficient hydrogen electrode catalyst toward both the hydrogen evolution reaction (HER) and the hydrogen oxidation reaction (HOR), which was in situ converted to crystalline counterparts and partially oxidized during the electrochemical cycling, leading to the self-activated enhancements of both HER and HOR activities with the decreased overpotential by 5 times and the increased hydrogen oxidation current density by 67%, respectively. Especially, in addition to 12 times higher mass activity compared to benchmark Pt/C, in situ-activated A-Pt also demonstrated a lower HER overpotential even after 20 000 cycles than Pt/C. The significantly improved catalytic performance benefits from the rapid self-reconstruction processes (crystallization and oxidation) of the amorphous Pt during electrochemical cycling. This work shows the intriguing properties of the amorphous nanostructure and provides a new idea for designing an efficient electrocatalyst by phase engineering.

Enhanced transverse piezoelectric properties by composition and poling electric field induced phase transition in PIN–PMN–PT single crystal near morphotropic phase boundary

A monoclinic phase is the bridge between the rhombohedral and tetragonal phases in the Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 (PIN–PMN–PT) single crystal near the morphotropic phase boundary (MPB), which is related to the superior piezoelectric performance. In this paper, the different phase transition process in the unpoled PIN–PMN–PT single crystals near MPB induced by composition variation was presented first. Based on this, direct current poling (DCP) and alternating current treatment (ACT) were applied on these samples. Also, the crystals by DCP–ACT have shown a more complex ferroelectric phase transition process than that by DCP, which is related to the induced monoclinic phase by applying an AC electric field. The transverse piezoelectric properties of the PIN–PMN–PT single crystal with various compositions by DCP and DCP–ACT were compared. ACT enhanced the electromechanical coupling coefficient k31, elastic compliance constant S11E, and dielectric permittivity ε33T/ε0 of the pre-DCP PIN–PMN–PT single crystals in the macrorhombohedral phase. As a result, the transverse piezoelectric constant d31 of the crystals with various compositions was enhanced to be −1240, −1663, and −1252 pC/N by DCP–ACT, which were 61.7%, 73.0%, and 60.8% higher than that by DCP. However, ACT has little effect on the pre-DCP PIN–PMN–PT crystal with macrocoexistence of rhombohedral and monoclinic phases. The AC electric field could be a useful way for tuning the coexistence of rhombohedral and monoclinic phases in the PIN–PMN–PT crystal near MPB to achieve high transverse piezoelectric performance.

Estimation of Formation Temperature of the Noble Metal Mineralization of the Kovdor Alkaline-Ultrabasic Massif (Kola Peninsula)

In this work, mineralogical and geochemical data are presented for sulfide-rich phoscorites and carbonatites in the Kovdor massif. The PGE and Ag-bearing mineralization of bornite–chalcopyrite and Ag‑bearing mineralization of pyrrhotite–chalcopyrite associations were investigated. In carbonatite stage formation of massif, the noble metal minerals occurred during evolution of alkaline–ultrabasic melt and after separation of primary sulfide melt enriched in PGE, Au and Ag. According to the observed relationships, the minerals of PGE, Au, and Ag in bornite–chalcopyrite association are crystallized sequentially from magmatic to hydrothermal stages. Crystallization of Os, Ir, Pt and Pd minerals (erlichmanite, rustenburgite, isoferroplatinum, mertieite–II, etc.) occurred at temperature close to 480°С, while further decrease in the temperature and an increase in the Cu and Fe activity in the melt leads to the crystallization of Sb, Pb, As, Bi and Te-bearing minerals (sperrylite, tatyanaite, moncheite, stumpflite, etc.). Formation of Au and Ag-bearing minerals (electrum, silver, stromeyerite, lenaite, etc.) occurred at temperatures below 300 °C with relatively low sulfur activity. In carbonatites and phoscorites of the middle and late magmatic stages enriched with magnetite, pyrrhotite–chalcopyrite association with silver-bearing minerals was formed at temperatures below 300°C. Ag-bearing minerals were produced during hydrothermal recrystallization of Cu–Fe–Ni sulfides at temperature close to 150°C.

Proton-assisted calcium-ion storage in aromatic organic molecular crystal with coplanar stacked structure

Rechargeable calcium-ion batteries are intriguing alternatives for use as post-lithium-ion batteries. However, the high charge density of divalent Ca2+ establishes a strong electrostatic interaction with the hosting lattice, which results in low-capacity Ca-ion storage. The ionic radius of Ca2+ further leads to sluggish ionic diffusion, hindering high-rate capability performances. Here, we report 5,7,12,14-pentacenetetrone (PT) as an organic crystal electrode active material for aqueous Ca-ion storage. The weak π-π stacked layers of the PT molecules render a flexible and robust structure suitable for Ca-ion storage. In addition, the channels within the PT crystal provide efficient pathways for fast ionic diffusion. The PT anode exhibits large specific capacity (150.5 mAh g-1 at 5 A g-1), high-rate capability (86.1 mAh g-1 at 100 A g-1) and favorable low-temperature performances. A mechanistic study identifies proton-assisted uptake/removal of Ca2+ in PT during cycling. First principle calculations suggest that the Ca ions tend to stay in the interstitial space of the PT channels and are stabilized by carbonyls from adjacent PT molecules. Finally, pairing with a high-voltage positive electrode, a full aqueous Ca-ion cell is assembled and tested.

Improvement of temperature-stability and piezoelectric performance of Pb(In0.5Nb0.5)O3–PbTiO3 crystals via Nd doping

High-performance relaxor-PbTiO3 ferroelectric crystals have been widely applied in transduces, sensors and so on. The ferroelectric phase transition temperature restricts their application in automobile, deep oil-well detection and aerospace which requires high thermal stability. Decreasing the effects of ferroelectric phase transition is a promising strategy for improving the thermal stability. Here, the design strategy is structural regulation via rare earth doping tetragonal Pb(In1/2Nb1/2)O3–PbTiO3 (PIN-PT) crystals. The d33, k33 and TC of [001]c-oriented Nd-PIN-PT crystals are 750 pC/N, 87%, 250 °C. Compared with the d33 of tetragonal 0.61PIN-0.39 PT crystals (540 pC/N) and tetragonal 0.35PIN-0.26 Pb(Mg1/3Nb2/3)O3 (PMN)-0.39 PT crystals (530 pC/N), the d33 of Nd-PINT crystals enhance by 39% and 41%. In addition, Nd-PIN-PT crystals have Qm of 110, which is larger than rhombohedral relaxor-PbTiO3 ferroelectric crystals (~50). Although the d33 of Nd-PIN-PT crystals is lower than that of rhombohedral relaxor-PT ferroelectric crystals, the d33 and k33 are stable up to 250 °C, which is higher than tetragonal PIN-PMN-PT crystals (210 °C). The high thermal stability of piezoelectric properties is related to the high thermal stability of domain after poling. This work provides a design strategy for high thermal stability ferroelectric crystals.

Shear piezoelectric properties d 24 and d 15 of the 0.58PMN-0.42PT crystal and the KNNLT crystal with 4 mm symmetry

The 3D space distributions of d 24 and d 15 of the 0.58PMN-0.42PT crystal and the KNNLT crystal were calculated by the method of the coordinate system rotation. For the 0.58PMN-0.42PT crystal, the values of d 24 were larger than those of d 15 except the directions of the three coordinate axes. The maximum value of d 24 was 250.4pC/N when θ was 48 ̊ 36′, while the maximum value of d 15 was 131pC/N in the Z-axis direction. For the KNNLT crystal, the values of d 15 were larger than those of d 24 except the directions of the three coordinate axes.

The Magnetoelectric Effect in Ferroelectric/Ferromagnetic Film Hybrid Systems with Easy-Plane and Easy-Axis Anisotropy

The striction magnetoelectric effect in hybrid systems consisting of a magnetic film applied on the surface of a ferroelectric has been investigated. Films with planar (galfenol, nickel) and perpendicular (Co/Pt multilayer structures) magnetic anisotropy have been used. A PMN–PT crystal has served as ferroelectric. The hysteresis loops of magnetic films have been studied as a function of voltage applied to the ferroelectric crystal. A voltage applied to films with easy-plane anisotropy causes the anisotropy axis to turn in the plane of the sample. In structures with easy-axis anisotropy, the hysteresis shape changes, which, according to numerical simulation, may be associated with a change in interfacial Dzyaloshinsky–Moriya interaction at the Co/Pt interface.

Impact of alternating current electric field poling on piezoelectric and dielectric properties of Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 ferroelectric crystals

Compared with the state-of-the-art Pb(Zr,Ti)O3 ceramics, relaxor-PbTiO3 (PT) based ferroelectric single crystals possess much higher piezoelectricity, thus receiving considerable attention from the ferroelectric community. Recently, it was found that the alternating current electric field poling (AC-poling) could further improve the piezoelectricity of [001]-poled rhombohedral (R) relaxor-PT single crystals. In this work, we investigated the domain structures and electromechanical properties of alternating current electric field poled (AC-poled) relaxor ferroelectric Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 (PIN–PMN–PT) crystals with different orientations and phase structures, including [001]-oriented R PIN–PMN–PT (23/47/30), [011]-oriented R PIN–PMN–PT (23/47/30), and [001]-oriented monoclinic (MC) PIN–PMN–PT (22/44/34) single crystals. We found that the piezoelectric coefficient (d33), free dielectric permittivity (ɛ33T/ɛ0), and clamped dielectric permittivity (ɛ33S/ɛ0) for AC-poled [001]-oriented R PIN–PMN–PT (23/47/30) crystals were improved by 24.4%, 22.6%, and 8.5%, respectively, when compared with the direct current electric field poled (DC-poled) counterparts. This phenomenon is attributed to the increase of domain size according to the observations from polarized light microscopy. Nevertheless, for [011]-poled R PIN–PMN–PT and [001]-poled MC PIN–PMN–PT crystals, the dielectric permittivities and piezoelectric coefficients were decreased a bit by AC-poling, being attributed to the depolarization phenomenon caused by the AC electric field. This work demonstrates that impacts of AC-poling on the properties of ferroelectrics are highly related to the orientation and phase of ferroelectric crystals.

Pure mode axis and the electromechanical coupling coefficients of the 0.67Pb(Mg1/3Nb2/3) O3-0.33PbTiO3 single crystal

Pure mode axes of the 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 (PMN-0.33PT) single crystals are investigated by slowness surfaces method. It is found only the Z-axis is a pure mode axis. The piezoelectricically stiffened Christoffel equation of the PMN-0.33PT crystal is solved in the rotating coordinate system. All of the single acoustic modes of thickness vibration are obtained. For the pure longitudinal mode of Z-cut crystal, the electromechanical coupling coefficient is up to 0.82. However, it is only 0.34 for the pure shear modes of X-cut or Y-cut crystal. It is along the pure mode axis that the maximum electromechanical coupling coefficients can be achieved.

Pb(Er1/2Nb1/2)O3–Pb(Zn1/3Nb2/3)O3–PbTiO3 Single Crystals with High Curie Temperature

In this work, 0.15Pb(Er1/2Nb1/2)O3–0.63Pb(Zn1/3Nb2/3)O3–0.22PbTiO3 (15PEN–63PZN–22PT) single crystals with a pure perovskite structure are obtained through the flux method. The phase structure, dielectric, ferroelectric properties and upconversion photoluminescence of the crystals are studied. The ternary crystals along the [110] orientation have a high Curie temperature (Tc = 250 °C) and large coercive field (Ec = 11.0597 kV/cm) which are higher than those of crystals reported previously. Furthermore, the PEN–PZN–PT crystals are produced with a strong green light excited by a 980 nm laser. Being in the range 298–478 K, the emission intensity of all peaks decreases with increase in temperature. The absolute quantum yield (QY) for the crystals is 0.00059%. These excellent properties provide new possibilities for multifunctional materials of optoelectronic devices.

Temperature Dependence of Electrical Properties and Phase Transition Characteristics of [001]‐Oriented Rhombohedral Mn‐0.15PIN‐0.55PMN‐0.30PT Single Crystal

Dielectric, piezoelectric, and ferroelectric properties of [001]‐oriented Mn‐0.15PIN‐0.55PMN‐0.30PT crystal are studied as functions of temperature. The single crystal exhibits excellent piezoelectric properties (d33 ~ 1330 pC N−1), higher ferroelectric to ferroelectric phase transition temperature (TR‐M ~ 112 °C), and larger coercive field (Ec ≈4.5 kV cm−1) than the binary PMN‐PT with morphotropic phase boundary compositions. Temperature‐induced phase transition characteristics of Mn‐0.15PIN‐0.55PMN‐0.30PT crystal are investigated by the temperature‐dependence Raman spectroscopy, and the temperature‐dependent electrical properties analysis shows that the values of Smax%, Q, and d33* are significantly dependent on the ferroelectric phase transitions. The results are beneficial to deeply understand the relationships between structure and properties in ternary Mn‐0.15PIN‐0.55PMN‐0.30PT single crystals.

The intrinsic and extrinsic contributions in [001] oriented (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 crystals

The dielectric and piezoelectric response of [001] poled (1-x)Pb(Mg1/3Nb2/3)O3 -xPbTiO3 (PMN-xPT) crystals was investigated as a function of composition and phase using Rayleigh analysis. The intrinsic dielectric and piezoelectric response of the monoclinic (M) phase PMN-0.32PT crystal, exhibited higher values (8155, 1963 pm/V) than the rhombohedral (R) phase PMN-0.31PT crystal (3297, 1342 pm/V). However, the extrinsic contribution on the total dielectric and piezoelectric responses of PMN-0.32PT crystal, is larger than PMN-0.31PT crystal. This ultrahigh electric response was determined with the crystal structure, the nature of the morphotropic phase boundary (MPB). Unfortunately, the intrinsic and extrinsic contributions to electric responses was not used by the Rayleigh law for the tetragonal PMN-0.36PT crystal, due to 90° domain wall motion.

AFM-tip written normal and anomalous domains in PMN-0.4PT crystals

At present, crystals of the solid solutions Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) are under intensive investigation due to their excellent piezoelectric characteristics. Studies in domain engineering are of importance for an insight into the contribution from the domain formation and resulting domain-wall density to piezoelectric coefficients. In this work, the fabrication of domains by dc AFM-tip voltages was studied in the tetragonal PMN-0.4PT crystals. Two types of domains were observed, either uniformly polarized along the poling field (the “normal” ones), or, following the commonly accepted term, “anomalous” ones containing a small area with the polarization directed oppositely to the poling field. In this work, for the first time, the correlation between the domain shape and the local piezoelectric hysteresis loops Hω−Utip was found, namely, the larger is the local bias voltage Ub, the higher is the tip voltage Utip at which the anomalous domains appear. This finding relates the observed scatter in the exposure conditions corresponding to the anomalous domains formation, to the nonuniform spatial distribution of the local bias fields. The domain diameter D vs Utip and pulse duration tp were investigated for Utip ≤ 50 V and tp from 10 ms to 10 s. The exposure characteristics are independent of the domain shape. For a given tp, D(Utip) is described by a unified linear function in the whole Utip range. The curves D(tp) follow a power law D∼tpk with the exponent k varying very weakly with Utip. The relaxation kinetics of anomalous domains depends on the writing conditions. The normal domains are found to decay significantly faster than the anomalous ones, with the decay kinetics depending on the domain spacing.

Structures and pyroelectric properties for [111]‐oriented Mn‐doped rhombohedral 0.36PIN‐0.36PMN‐0.28PT crystal

AbstractThe crystal structures, pyroelectric properties, and thermal stability of [111]‐oriented 0.5 mol% Mn‐doped 0.36Pb(In1/2Nb1/2)O3‐0.36Pb(Mg1/3Nb2/3)O3‐0.28PbTiO3 (Mn‐0.36PIN‐0.36PMN‐0.28PT) ternary single crystal were investigated. The temperature dependence of the Raman spectra and dielectric properties revealed that the crystal exhibited a rhombohedral (R) structure at room temperature, and ferroelectric R → tetragonal (T) and ferroelectric T to paraelectric cubic (C) phase transitions at 130 and 175°C respectively. The single crystal had a high remnant polarization of Pr = 38 μC cm–2 and coercive field of EC = 12 kV cm–1 at room temperature and a frequency of f = 100 Hz. The values of Pr and EC decreased with increasing temperature, exhibiting anomalies near their phase‐transition temperatures, which coincided with changes in the Raman spectra and dielectric properties. Furthermore, at 25°C and f = 100 Hz, the single crystal had high pyroelectric coefficients of p = 8.7 × 10−4 C m−2 K−1, figures of merit for the current responsivity of Fi = 3.5 × 10−10 m V−1, the voltage responsivity of Fv = 0.08 m2 C−1, and the detectivity of Fd = 30.1 × 10−5 Pa−1/2. These values were weakly dependent on temperature below 120°C. In addition, the room‐temperature pyroelectric coefficients of the ternary single crystal maintain over 83% of the original value at thermal annealing temperatures below 120°C. These outstanding pyroelectric properties, together with high thermal stability, indicate that [111]‐oriented rhombohedral Mn‐0.36PIN‐0.36PMN‐0.28PT ternary single crystal is a new potential candidate for infrared detection applications.

Linear optical properties and second-harmonic generation of (1-x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 single crystals

Transmission spectrum and refractive index of (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 (PMN-xPT) single crystals were studied and second-harmonic generation signal of the crystal powder was measured in order to characterize the nonlinear optical properties of the crystals. The poling procedure led to increase in the optical transmittance in visible spectral region. PMN-xPT single crystals were optically negative and the refractive index increased with PT concentration. Moreover, PMN-xPT crystals proved to have high nonlinear optical properties and the second-harmonic generation signal measured in powder of PMN-0.39PT crystal was greater than that of KH2PO4, KTiOPO4, and LiNbO3.

Electric and optical properties of Tm3+/Yb3+co-doped PZN–9PT crystals

Tm3+/Yb3+co-doped Pb(Zn1/3Nb2/3)O3–9PbTiO3 (PZN–9PT) single crystals were grown by high-temperature flux technique. The effects of Tm3+/Yb3+ ions doping on phase structure, dielectric, ferroelectric and UC luminescence properties were investigated. The XRD, Raman spectrum and TEM results reveal that the Tm3+/Yb3+ ions can diffuse into the lattice of the PZN–9PT and increase the lattice constants. The Curie temperature Tc increases from 170 °C for pure PZN–9PT to 182.5 °C for PZN–9PT: Tm3+/Yb3+. Meanwhile, the coercive field Ec of Tm3+/Yb3+ co-doped PZN–9PT reaches to 12.1 kV/cm which is nearly four times higher than that of PZN–9PT crystal. Under a 980 nm laser excitation, crystals modified by the Tm3+/Yb3+ produce UC with three colors: blue (480 nm, 1G4 → 3H6), strong near-infrared (NIR, 804 nm, 3H4 → 3H6) and weak red (652 nm, 1G4 → 3F4). Our results can provide a new way for the design of multifunctional materials used in optical-electrical devices.