Method for information storage based on hybrid material

Abstract

The present disclosure belongs to the technical field of information storage, and particularly relates to a method for information storage based on a hybrid material. The method for information storage based on a hybrid material provided by the present disclosure includes a step of applying an external force to a hybrid material for driving, such that the hybrid material shows a fluorescent state or a non-fluorescent state, thereby realizing two-state or three-state information storage. By only applying the external force to the selected hybrid material for driving, energy band alignment methods can be transformed under the driving of the external force with an energy level difference between different components in the hybrid material. Therefore, the hybrid material shows the component fluorescent state or the non-fluorescent state. One storage cell has two or three states, so the present disclosure can be used to store two-state or three-state data.

Claims

1. A method for information storage based on a hybrid material, comprising a step of applying an external force to a hybrid material for driving, such that the hybrid material shows a fluorescent state or a non-fluorescent state, thereby realizing information storage, wherein the hybrid material comprises a component A and a component B; and an energy level difference is provided between the component A and the component B.

2. The method for information storage based on a hybrid material according to claim 1, wherein in the hybrid material, at least one of an energy level difference (E) between a conduction band of the component A and a conduction band of the component B, and an energy level difference (E) between a valance band of the component A and a valance band of the component B is less than 200 meV.

3. The method for information storage based on a hybrid material according to claim 2, wherein under the driving of the external force, a movement speed of each of the conduction band and the valance band of the component B is greater than a movement speed of each of the conduction band and the valance band of the component A.

4. The method for information storage based on a hybrid material according to claim 3, wherein in the hybrid material, an energy of the conduction band of the component A is lower than an energy of the conduction band of the component B, and an energy of the valance band of the component A is higher than an energy of the valance band of the component B.

5. The method for information storage based on a hybrid material according to claim 3, wherein in the hybrid material, an energy of the conduction band and an energy of the valance band of the component A are respectively lower than an energy of the conduction band and an energy of the valance band of the component B, or the energy of the conduction band and the energy of the valance band of the component A are respectively higher than the energy of the conduction band and the energy of the valance band of the component B.

6. The method for information storage based on a hybrid material according to claim 3, wherein a lattice of the component B is more flexible than a lattice of the component A.

7. The method for information storage based on a hybrid material according to claim 2, wherein the external force comprises a pressure and/or a tensile force.

8. The method for information storage based on a hybrid material according to claim 1, wherein under the driving of the external force, a movement speed of each of the conduction band and the valance band of the component B is greater than a movement speed of each of the conduction band and the valance band of the component A.

9. The method for information storage based on a hybrid material according to claim 8, wherein in the hybrid material, an energy of the conduction band of the component A is lower than an energy of the conduction band of the component B, and an energy of the valance band of the component A is higher than an energy of the valance band of the component B.

10. The method for information storage based on a hybrid material according to claim 9, wherein the external force comprises a pressure and/or a tensile force.

11. The method for information storage based on a hybrid material according to claim 9, wherein when the external force is not applied or an external force with a first external force value is applied to the hybrid material, the hybrid material has type-I energy band alignment; and/or, when an external force with a second external force value is applied to the hybrid material, the hybrid material has type-II energy band alignment; and/or, when an external force with a third external force value is applied to the hybrid material, the hybrid material has the type-I energy band alignment.

12. The method for information storage based on a hybrid material according to claim 11, wherein when the external force is not applied or the external force with the first external force value is applied to the hybrid material, the hybrid material shows a component A fluorescent state; and/or when the external force with the second external force value is applied to the hybrid material, the hybrid material shows the non-fluorescent state; and/or when the external force with the third external force value is applied to the hybrid material, the hybrid material shows a component B fluorescent state.

13. The method for information storage based on a hybrid material according to claim 12, wherein the component A fluorescent state is defined as 0, the non-fluorescent state is defined as 1, and the component B fluorescent state is defined as 2, thereby realizing two or three storage states in one storage cell.

14. The method for information storage based on a hybrid material according to claim 11, wherein the first external force value is less than the second external force value, and the second external force value is less than the third external force value.

15. The method for information storage based on a hybrid material according to claim 8, wherein in the hybrid material, an energy of the conduction band and an energy of the valance band of the component A are respectively lower than an energy of the conduction band and an energy of the valance band of the component B, or the energy of the conduction band and the energy of the valance band of the component A are respectively higher than the energy of the conduction band and the energy of the valance band of the component B.

16. The method for information storage based on a hybrid material according to claim 15, wherein when the external force is not applied or an external force with a first external force value is applied to the hybrid material, the hybrid material has type-II energy band alignment; and/or, when an external force with a third external force value is applied to the hybrid material, the hybrid material has type-I energy band alignment.

17. The method for information storage based on a hybrid material according to claim 16, wherein when the external force is not applied or the external force with the first external force value is applied to the hybrid material, the hybrid material shows the non-fluorescent state; and/or, when the external force with the third external force value is applied to the hybrid material, the hybrid material shows a component B fluorescent state.

18. The method for information storage based on a hybrid material according to claim 8, wherein a lattice of the component B is more flexible than a lattice of the component A.

19. The method for information storage based on a hybrid material according to claim 8, wherein the external force comprises a pressure and/or a tensile force.

20. The method for information storage based on a hybrid material according to claim 1, wherein the external force comprises a pressure and/or a tensile force.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) To make the content of the present disclosure more comprehensible and clearer, the following describes the present disclosure in more detail with reference to the specific embodiments and accompanying drawings of the present disclosure.

(2) FIG. 1 illustrates transformation of type-I energy band alignment and type-II energy band alignment between a component A and a component B in a hybrid material according to Embodiment 1;

(3) FIGS. 2A-C illustrate fluorescence spectrums of a hybrid material (BTm).sub.2PbI.sub.4 under different pressures;

(4) FIG. 3 illustrates transformation of type-I energy band alignment and type-II energy band alignment between a component A and a component B in a hybrid material according to Embodiment 4; and

(5) FIGS. 4A-B illustrate fluorescence spectrums of a hybrid material (4Tm).sub.2PbI.sub.4 under different pressures.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(6) To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure are clearly and completely described below with reference to the embodiments of the present disclosure.

EMBODIMENT 1

(7) In the embodiment, a hybrid material (BTm).sub.2PbI.sub.4 is prepared with an anti-solvent diffusion method.

(8) 0.04 mmol of BTmI and 0.02 mmol of PbI2 are dissolved into 1 mL of gamma-butyrolactone. With chlorobenzene and chloroform as anti-solvents, bulk crystals can be obtained after 72 h.

EMBODIMENT 2

(9) In the embodiment, a pressure is applied to the hybrid material (BTm).sub.2PbI.sub.4 to obtain energy band alignment of the hybrid material. The energy band alignment of the hybrid material (BTm).sub.2PbI.sub.4 is as shown in FIG. 1.

(10) As can be seen, an energy of a conduction band of a component A is lower than an energy of a conduction band of a component B, and an energy of a valance band of the component A is higher than an energy of a valance band of the component B. Energy level differences (E1 and E2) between the component A and the component B are less than 200 meV. Through testing, energy level differences (E1 and E2) between the component [BTm] and the component [PbI.sub.4] in the hybrid material are about 80 meV.

(11) According to results shown in FIG. 1, without an external force, type-I energy band alignment is provided between the [BTm.sup.+] (component A) and the [PbI.sub.4] (component B), and the material shows a [BTm.sup.+] fluorescent state. When the external force (a pressure or a tensile force) is applied, the component [BTm.sup.+] and the component [PbI.sub.4] move downward in the conduction band, and move upward in the valance band. A movement speed of each of the conduction band and the valance band of the [PbI.sub.4] is greater than a movement speed of each of the conduction band and the valance band of the [BTm.sup.+]. The energy band alignment between the [BTm.sup.+] and the [PbI.sub.4] is changed. As shown in FIG. 1, when the external force reaches a special value, the energy of the valance band of the [PbI.sub.4] is higher than the energy of the valance band of the [BTm.sup.+]. The hybrid material is transformed from the type-I energy band alignment to type-II energy band alignment, and shows a non-fluorescent state. When the external force applied on the hybrid material reaches another special value, the energy of the condition band of the [PbI.sub.4] is lower than the energy of the conduction band of the [BTm.sup.+]. The hybrid material is transformed from the type-II energy band alignment to the type-I energy band alignment, and shows a [PbI.sub.4] fluorescent state.

EMBODIMENT 3

(12) In the embodiment, pressures with different intensities are applied to the hybrid material (BTm).sub.2PbI.sub.4. A pressure environment is provided by a diamond anvil cell (DAC). Type II-a ultra-low fluorescent diamond with a size of 500 m is used. A high-pressure sample chamber is composed of a stainless steel gasket with a thickness of about 50 m and a hole with a diameter of about 300 m. The hybrid material (BTm).sub.2PbI.sub.4 and a pressure measuring ruby ball are placed into the chamber. A ruby fluorescence method is used for measuring the pressures, and a mineral oil is used as a pressure transmitting medium.

(13) The pressures are applied to the hybrid material with the DAC, and spectrum detection is performed. Results are as shown in FIGS. 2A-C.

(14) As can be seen, the hybrid material (BTm).sub.2PbI.sub.4 has a wide fluorescence peak (a full width at half maximum (FWHM) is 104.7 nm) at 0 GPa, and the fluorescence comes from the [BTm.sup.+] organic cell. This is called the [BTm.sup.+] fluorescent state. The hybrid material (BTm).sub.2PbI.sub.4 does not generate fluorescence at 2.5 GPa. This is called the non-fluorescent state. The hybrid material (BTm).sub.2PbI.sub.4 has a narrow fluorescence peak (an FWHM is 33.3 nm) at 4.5 GPa, and the fluorescence comes from the [PbI.sub.4] inorganic cell. This is called the [PbI.sub.4] fluorescent state.

(15) In information storage, the state with the fluorescence peak wider than 100 nm is defined as a state 0, the state without the fluorescence peak is defined as a state 1, and the state with the fluorescence peak narrower than 35 nm is defined as a state 2. In the embodiment, the [BTm.sup.+] fluorescent state, the non-fluorescent state and the [PbI.sub.4] fluorescent state of the hybrid material (BTm).sub.2PbI.sub.4 are respectively corresponding to the state 0, the state 1 and the state 2. Therefore, the hybrid material (BTm).sub.2PbI.sub.4 can realize three-state information storage under the pressure.

EMBODIMENT 4

(16) In the embodiment, a hybrid material (4Tm).sub.2PbI.sub.4 is prepared with a slow cooling method.

(17) 0.02 mmol of 4TmI and 0.01 mmol of PbI.sub.2 are dissolved into 0.1 mL of HI, 0.05 mL of H.sub.3OP.sub.2 and 2 mL of isopropanol. A resulting solution is heated to 100 C. till complete dissolution, and slowly cooled to a room temperature (12 h).

EMBODIMENT 5

(18) In the embodiment, a pressure is applied to the hybrid material (4Tm).sub.2PbI.sub.4 to obtain energy band alignment of the hybrid material. The energy band alignment of the hybrid material (4Tm).sub.2PbI.sub.4 is as shown in FIG. 3.

(19) As can be seen, an energy of a conduction band and an energy of a valance band of a component B are respectively lower than an energy of a conduction band and an energy of a valance band of a component B. An energy level difference (E3) between the valance band of the component A and the valance band of the component B is less than 200 meV. Through testing, type-II energy band alignment is provided between the [4Tm] and the [PbI.sub.4] in the hybrid material, an energy level difference between the valance band of the [4Tm] and the valance band of the [PbI.sub.4] is about 150 meV, and the material shows a non-fluorescent state.

(20) According to results shown in FIG. 3, without an external force, type-II energy band alignment is provided between the [4Tm] and the [PbI4], and the material shows the non-fluorescent state. When the external force (a pressure or a tensile force) is applied, the energy band alignment between the [4Tm] and the [PbI.sub.4] is changed. As shown in FIG. 3, when the external force reaches a special value, the hybrid material is transformed from the type-II energy band alignment to type-I energy band alignment, and shows a [PbI.sub.4] fluorescent state.

EMBODIMENT 6

(21) In the embodiment, pressures with different intensities are applied to the hybrid material (4Tm).sub.2PbI.sub.4. A pressure environment is provided by a DAC. Type II-a ultra-low fluorescent diamond with a size of 500 m is used. A high-pressure sample chamber is composed of a stainless steel gasket with a thickness of about 50 m and a hole with a diameter of about 300 m. The hybrid material (4Tm).sub.2PbI.sub.4 and a pressure measuring ruby ball are placed into the chamber. A ruby fluorescence method is used for measuring the pressures, and a mineral oil is used as a pressure transmitting medium.

(22) The pressures are applied to the hybrid material with the DAC, and spectrum detection is performed. Results are as shown in FIGS. 4A-B.

(23) The hybrid material (4Tm).sub.2PbI.sub.4 does not generate fluorescence at 0 GPa. This is called the non-fluorescent state. The hybrid material (4Tm).sub.2PbI.sub.4 has a narrow fluorescence peak (an FWHM is 14 nm) at 4 GPa, and the fluorescence comes from the [PbI.sub.4] inorganic cell. This is called the [PbI.sub.4] fluorescent state.

(24) In information storage, the state with the fluorescence peak is defined as a state 1, and the state without the fluorescence peak is defined as a state 0. The non-fluorescent state and the[PbI.sub.4] fluorescent state of the hybrid material (4Tm).sub.2PbI.sub.4 are respectively corresponding to the state 0 and the state 1. Therefore, the hybrid material (BTm).sub.2PbI.sub.4 can realize two-state information storage under the pressure.

(25) The embodiments of the present disclosure are described above. Several examples are used for illustration of the principles and implementations of the present disclosure. The description of these embodiments is used to help illustrate the method and its core principles. Those skilled in the art can make variations to the disclosure in specific implementation and application scope based on a concept of the present disclosure. To sum up, the contents in the description shall not be understood as limitations to the present disclosure.