Glass composition, component, and method for producing a component

Abstract

A glass composition, a device and a method for producing the device are disclosed. In an embodiment, the glass composition includes a tellurium oxide in a proportion of at least 65 mol. % and at most 90 mol. %, R.sup.1O in a proportion between 0 mol. % and 20 mol. %, wherein R.sup.1 is selected from Mg, Ca, Sr, Ba, Zn, Mn and combinations thereof and at least one M.sup.1.sub.2O in a proportion between 5 mol. % and 25 mol. %, wherein M.sup.1 is selected from Li, Na, K and combinations thereof. The glass component further includes at least one R.sup.2.sub.2O.sub.3 in a proportion between 1 mol. % and 3 mol. %, wherein R.sup.2 is selected from Al, Ga, In, Bi, Sc, Y, La, rare earths and combinations thereof, and M.sup.2O.sub.2 in a proportion between 0 mol. % and 2 mol. %, wherein M.sup.2 is selected from Ti, Zr, Hf and combinations thereof.

Claims

1. A glass composition comprising: at least one tellurium oxide in a proportion of at least 65 mol. % and at most 90 mol. %; R.sup.1O in a proportion between 10 mol. % and 20 mol. %, wherein R.sup.1 is selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Mn and combinations thereof; at least one M.sup.1.sub.2O in a proportion between 5 mol. % and 25 mol. %, wherein M.sup.1 is selected from the group consisting of Li, Na, K and combinations thereof; at least one R.sup.2.sub.2O.sub.3 in a proportion between 1 mol. % and 3 mol. %, wherein R.sup.2 is selected from the group consisting of Al, Ga, In, Bi, Sc, Y, La, rare earths and combinations thereof; M.sup.2O.sub.2 in a proportion between 0 mol. % and 2 mol. %, wherein M.sup.2 is selected from the group consisting of Ti, Zr, Hf and combinations thereof; and R.sup.3.sub.2O.sub.5 in a proportion between 0 mol. % and 6 .%, wherein R.sup.3 is selected from Nb and/or Ta, wherein a sum of all proportions of tellurium oxide, M.sup.1.sub.2O, R.sup.2.sub.2O.sub.3, M.sup.2O.sub.2, R.sup.3.sub.2O.sub.5 and R.sup.1O in the glass composition is 100 mol. %, and wherein the glass composition is free of boron trioxide, germanium oxide, phosphates, halides, P.sub.2O.sub.5, silicon dioxide and silicates.

2. The glass composition according to claim 1, wherein the glass composition consists essentially of tellurium oxide, M.sup.1.sub.2O, R.sup.1O and R.sup.2.sub.2O.sub.3, wherein tellurium oxide is in a proportion of at least 65 mol. % and at most 90 mol. % present, wherein R.sup.1O is in a proportion between 0 mol. % and 20 mol. % present, wherein R.sup.1 is selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Mn and combinations thereof, wherein M.sup.1.sub.2O is in a proportion between 10 mol. % and 12 mol. % present, wherein M.sup.1 is selected from the group consisting of Li, Na, K and combinations thereof, wherein R.sup.2.sub.2O.sub.3 is in a proportion between 1.5 mol. % and 2 mol. % present, wherein R.sup.2 is selected from the group consisting of Al, Ga, In, Bi, Sc, Y, La, rare earths and combinations thereof.

3. The glass composition according to claim 1, wherein the tellurium oxide is TeO.sub.2 and comprises a proportion of at least 67 mol. % and at most 69 mol. %.

4. The glass composition according to claim 1, wherein R.sup.1O has a proportion of between 14 mol. % and 18 mol. %.

5. The Glass composition according to claim 1, wherein M.sup.1.sub.2O has a proportion of between 8 mol. % and 14 mol. %.

6. The glass composition according to claim 1, wherein R.sup.2 is selected from the group consisting of Al, La, Y and Bi, and wherein R.sup.2.sub.2O.sub.3 comprises a proportion between 1.5 mol. % and 2.5 mol. %.

7. The glass composition according to claim 1, wherein the glass composition consists essentially of tellurium oxide, M.sup.1.sub.2O, R.sup.2.sub.2O.sub.3, and wherein R.sup.2.sub.2O.sub.3 comprises a proportion between 1.5 mol. % and 2 mol. %.

8. The glass composition according to claim 1, wherein the glass composition has a glass transition temperature of less than 320 C. and has a dilatometric softening temperature of less than 400 C.

9. The glass composition according to claim 1, wherein the glass composition is radiation-permeable so that at least 90% of an incident electromagnetic radiation from a wavelength range of 380 nm to 800 nm is transmitted.

10. A device comprising: a first mounting element with a mounting surface; the glass composition according to claim 1; and a second mounting element, wherein the glass composition is arranged between the mounting surface of the first mounting element and the second mounting element, wherein the glass composition is formed as an adhesive layer, and wherein the glass composition connects the mounting surface of the first mounting element and the second mounting element to one another.

11. The device according to claim 10, wherein each of the first mounting element and the second mounting element is selected from a semiconductor chip, a ceramic, a silicate glass, a metal, a conversion ceramic, a lens or combinations thereof, and wherein the first mounting element and/or the second mounting element include a functional oxidic coating.

12. The device according to claim 10, wherein the first mounting element is a semiconductor chip and the second mounting element is a transparent silicate glass, a converting ceramic or a transmitting ceramic.

13. The device according to claim 10, wherein the first mounting element is a ceramic or a metal and the second mounting element is a ceramic.

14. A method for producing a device according to claim 10, the method comprising: providing the first mounting element comprising a mounting surface; applying the glass composition directly to the mounting surface; applying the second mounting element to the glass composition; and heating the device to at most 400 C. so that a bond is produced between the mounting surface of the first mounting element and the glass composition and the second mounting element.

15. The method according to claim 14, wherein applying the glass composition to the mounting surface of the first mounting element comprises applying the glass composition as a powder or preproduced body.

16. A glass consisting essentially of tellurium oxide, M.sup.1.sub.2O, R.sup.1O and R.sup.2.sub.2O.sub.3, wherein tellurium oxide is in a proportion of at least 65 mol. % and at most 90 mol. % present, wherein R.sup.1O is in a proportion between 10 mol. % and 20 mol. % present, wherein R.sup.1 is selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Mn and combinations thereof, wherein M.sup.1.sub.2O is in a proportion between 10 mol. % and 12 mol. % present, wherein M.sup.1 is selected from the group consisting of Li, Na, K and combinations thereof, wherein R.sup.2.sub.2O.sub.3 is in a proportion between 1.5 mol. % and 2 mol. % present, wherein R.sup.2 is selected from the group consisting of Al, Ga, In, Bi, Sc, Y, La, rare earths and combinations thereof.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) A glass composition described herein, a device and a method for producing a device are explained in more detail hereinunder with reference to the drawing and with the aid of exemplified embodiments. Like reference numerals designate like elements in the individual figures. However, no references to scale are shown. Rather, individual elements can be illustrated in greatly exaggerated fashion for improved understanding.

(2) In the drawing:

(3) FIG. 1 shows exemplified embodiments A1 to A7 of a glass composition and comparative examples V1 to V4,

(4) FIG. 2 shows a transmission spectrum of an exemplified embodiment,

(5) FIG. 3 shows an X-ray diffraction diagram of an exemplified embodiment,

(6) FIG. 4 shows a transmission spectrum of an exemplified embodiment,

(7) FIG. 5 shows a transmission spectrum of an exemplified embodiment,

(8) FIG. 5a shows a comparison of X-ray diffraction diagrams of three exemplified embodiments, and

(9) FIGS. 6 and 7 each show a device according to one embodiment.

DETAILED DESCRIPTION OF ILLUSRTRATIVE EMBODIMENTS

(10) FIG. 1 shows embodiments A1 to A7 of a glass composition, in table form. Furthermore, the table shows comparative examples V1 to V4 of conventional glass compositions. The values given in the table include a maximum error of 5%. The glass compositions of exemplified embodiments A1 to A7 comprise tellurium oxide. In particular, tellurium oxide is TeO.sub.2. The proportion of tellurium oxide in A1 to A7 is between 67 mol. % and 69 mol. %. In particular, the proportion of tellurium oxide is between 67.5 mol. % and 68.5 mol. %.

(11) The glass composition further comprises R.sup.1O as a zinc oxide. The proportion of zinc oxide is between 18 mol. % and 20 mol. % inclusive.

(12) The glass composition further comprises M.sup.1.sub.2O in the form of disodium oxide. The proportion of disodium oxide in the glass composition is between 10 mol. % and 12 mol. % inclusive.

(13) Furthermore, the glass composition comprises an oxide of a trivalent metal, such as, for example, aluminum trioxide, lanthanum trioxide, bismuth trioxide and/or yttrium trioxide. The proportion of the oxide of a trivalent metal is between 1.5 mol. % and 2.5 mol. %.

(14) Furthermore, FIG. 1 shows the glass transition temperatures T.sub.g in C. for exemplified embodiments A1 to A7 determined by dilatometry. The glass transition temperatures are between 283 C. and 294 C. In particular, the glass transition temperatures of the glass compositions are <295 C.

(15) Furthermore, FIG. 1 shows the associated coefficients of thermal expansion and the softening temperatures T.sub.e in C. of exemplified embodiments A1 to A7. T.sub.e is between 308 C. and 323 C. and was determined by dilatometry.

(16) Furthermore, FIG. 1 shows a refraction index n for exemplified embodiments A2, A5 and A6 of ca. 2, which was determined at a wavelength of 546.06 nm.

(17) Comparative examples V1 to V4 are shown as a comparison to this. Comparative examples V1 to V4 differ from exemplified embodiments A1 to A7 in particular in that the glass composition of V1 to V4 comprises no oxides of trivalent metals. In a corresponding manner, the comparative examples show higher softening temperatures Te of 329 C. (V2, V4) and/or a strong crystallization tendency (V1, V3), in particular during production.

(18) FIG. 2 shows a transmission spectrum for exemplified embodiment A2, which is shown in the table of FIG. 1. The transmission T in % is shown in dependence upon the wavelength in nm. Curve 1 shows the glass composition prior to a weathering test, wherein the wall thickness WD of the sample WD=0.89 mm. Curve 2 shows the transmission curve of the glass composition of A2 after the weathering test was carried out. The weathering test took place in such a way that the glass composition was subjected to a temperature of 85 C. at a relative humidity of 85% and over 1000 hours. A comparison of the glass composition before (curve 1) and after (curve 2) the weathering test shows essentially no difference in transmission. It can be concluded from this that the glass composition or the glass did not change during the test. Thus, the glass composition of exemplified embodiment A2 is particularly weather-resistant and corrosion-resistant.

(19) FIG. 3 shows an X-ray diffraction diagram of exemplified embodiment A2 according to the table in FIG. 1. The intensity I in a.u. (arbitrary units) is shown in dependence upon 2 in . From the graph it is possible to see that the glass composition is purely amorphous and not present in crystallized form. This is advantageous since, as a result, the glass composition in particular scatters no electromagnetic radiation from the visible range.

(20) FIG. 4 shows a transmission spectrum of exemplified embodiment A6 of the table in FIG. 1. The transmission T in % is shown in dependence upon the wavelength in nm. Curve 1 shows the glass composition with a wall thickness of 0.98 mm prior to the weathering test, curve 2 shows the glass composition after the weathering test. The transmission does not substantially change owing to the influence of temperature, relative humidity and over time (1000 hours) in the entire wavelength range from 200 nm to 1000 nm.

(21) FIG. 5 shows a transmission spectrum with T in % in dependence on the wavelength in nm of exemplified embodiment A7 with a wall thickness of 0.96 mm from the table in FIG. 1. The transmission curves before (curve 1) and after (curve 2) the weathering test are shown. Exemplified embodiment A7 is also weather-resistant.

(22) FIG. 5a shows an X-ray diffraction diagram of each exemplified embodiment A2, A5 and A6 according to the table in FIG. 1. The intensity I in a.u. (arbitrary units) is shown in dependence upon 2 in . From the graph it is possible to see that the glass compositions A2, A5 and A6 are purely amorphous and no crystals are present. This is advantageous since, as a result, the glass composition in particular scatters no electromagnetic radiation from the visible range.

(23) FIG. 6 shows a schematic side view of a device 10 according to one embodiment. A glass composition is applied to a first mounting element 6. The glass composition 2a is formed as a glass layer. The glass composition or glass layer 2a can be applied in the form of a powder. Alternatively, the glass composition or the glass layer 2a can be applied to the mounting surface of the first mounting element 6 in the form of a preproduced body, for example, a platelet or a fiber portion or a sphere or hemisphere. Furthermore, a second mounting element 7 is applied to the glass composition or the glass layer 2a. This can also take place under weighting. By sintering at least the glass composition or the glass layer 2a, i.e. by raising the temperature to at the most 400 C., a bond can be produced between the first mounting element 6, the glass composition or the glass layer 2a and the second mounting element 7. Therefore, the glass composition or the glass layer 2a acts as an adhesion-promoting layer between the two mounting elements. In particular, the glass composition according to the invention is suitable for joining temperature-sensitive mounting elements since it has a softening temperature of below 400 C. and at the same time is corrosion-stable and crystallization-stable.

(24) Alternatively, the adhesion can also take place under negative pressure and/or with weighting at the same or a lower temperature.

(25) In particular, the adhesion depicted in FIG. 6 can also occur multiple times in a device. This would be, for example, adhesion of a semiconductor chip to a conversion ceramic to which a lens is adhered.

(26) FIG. 7 shows a schematic side view of a device 10, for example, an optoelectronic device, according to one embodiment. The semiconductor chip 1 is arranged on a carrier 5. A glass composition 2a and a conversion layer 2 are then arranged. The conversion layer 2 is in particular ceramic. The device 10 can be produced by the provision of a carrier 5 and application of a semiconductor chip 1. The glass composition can then be applied to the radiation exit surface ii of the semiconductor chip 1. The glass composition 2a can thus be applied as a preproduced body, for example, as a platelet, or applied as powder or as glass spheres. The application in the form of a platelet to the radiation exit surface 11 of the semiconductor layer sequence 1 can be carried out in a so-called pick-and-place process. The conversion element 2 can then be applied to the glass composition 2a, wherein the temperature is raised to at the most 350 C. and therefore the semiconductor chip 1 and the conversion element 2 are connected to one another. This is preferably carried out under weight. During application of the conversion element 2 to the glass composition 2a, this composition can protrude or spill over the side surfaces of the semiconductor chip 1 and/or over the flanks of the conversion element 2. This can happen, for example, owing to the use of larger quantities of liquid or pasty glass composition 2a. Thus the glass composition 2a forms a completely homogeneous layer on the radiation exit surface 11 of the semiconductor chip 1 and a type of bead over the radiation exit surface 11. In particular, the glass composition 2a pressed out in the form of a bead is colorless, which shows that the glass composition 2a was not discolored and was of low viscosity.

(27) The description using the exemplified embodiments does not limit the invention thereto; rather, the invention includes any feature and any combination of features, including in particular any combination of features in the claims, even if this feature or this combination is not itself explicitly indicated in the claims or exemplified embodiments.