A DIY OLED Display Really Surprised me!

[Music] hello everyone in this video I am going to show you a little but nonetheless an exciting process of making idea why or LED display using organic light-emitting diodes I think many of you have noticed that Israel has 10 years the technology of making OLED displays has significantly advanced that is why this type of matrix is used almost in all modern smartphones and it is used in TV displays as well as different monitors however back in the day when it was first invented in 1960 things were quite different today I'd like to repeat the experiments initially carried out 15 years ago and to make a DIY or LED display and show you how it is designed to make such organic light-emitting diodes first we need to prepare a transparent conducting field which is quite cheap these days and can be bought from different online shops the conducting layer consists of a mixture of teen and indium oxide plasma sprayed in special vacuum chambers however if you live in a jungle and Aliexpress doesn't do the levels there you can make such a film yourself this is what I try to do during the initial stage of the experiment I use tin chloride for Koji I'll be heating it using a regular gas burner until it breaks down when the temperature rises above 200 degrees Celsius tin chloride breaks down into water hydrogen Holroyd and tin oxides which can be deposited on the glass plate placed above creating a thin conducting layer of course in such initial conditions the oxide layer won't deposit evenly which I later confirmed using a multimeter I managed to fight only a few contact points in the conducting tin oxide layer the rest of the layer was too uneven besides the electrical resistance of my DIY conducting film was eight times greater than that of factory made layers that is why I decided not to use idea why conducting field and instead to use the ones made by a trusted Chinese manufacturer these plates are too big for my experiment that is why occurred them into smaller pieces using a diamond-tipped glass cutter the next stage of making an OLED display is spraying an organic so-called emissive layer I used one interesting chemical for making it it was trees the pyridine or tinium chloride this chemical is a coordination complex with a routine iam atom at the center which is quite rare and expensive metal in the ultraviolet light it glows bright orange the same happens when it is dissolved in water however and chews it not because it is beautiful rather because in the electric field this red and orange crystals can emit light on the round first I need to firmly fix this or TEM complex on the glass and I'm going to use a regular school glue for that transparent tubes with such colorless glue contain a solution of polyvinyl alcohol which remains transparent even after drying that's exactly what I need since I don't know the exact concentration of polyvinyl alcohol is a tube I'll trust my intuition here I single out about half a millimeter of such glue and mix it with Freeman and litres of water I got such a glue solution I need to dissolve the routine in complex in it we need 35 thousandths of a gram of it for three milliliters we can apply this solution to the glass in two ways we can just create it with that cotton swab but there is also a more technical Meadows in order for the layer to be more even I applied it using a DIY centrifuge which is a computer call it fan when the cooling fan spins the excess solution slides off the glass plate leaving a thin layer just several micrometers thick I good a few samples i coated two of them in an emissive layer using a regular of cotton swab and I used my centrifuge to cause the other samples now I'm going to leave them for one day in other for the layer to dry off the next day I notice that the coating which I applied using a cotton swab turn out to be extremely uneven and part of the ricean complex even crystallized other coatings looked more or less even but further tests are needed to see if it really so is the last but not least important stage of making such an OLED display is application of the second electrode on the dry emissive layer liquid metal fits perfectly I am going to use an array of indium and gallium I have a sufficient amount of these metals if I touch a piece of indium with a piece of Ganim zero form a liquid alloy and its melting temperature is just 16 degrees Celsius it's very handy to appliances earlier to such idea why LED display with a cotton swab after applying into several places I am connecting a positive electrode in other words a note to the conducting film and I am connecting carrot or in other words the negative electrode to the liquid metal layer I say the voltage to four walls but I can't see glowing yet hmm strangely enough all of my attempts to make this LED display glow have failed maybe that's because I added too little glue to the solution for emissive coating which is why part of their scene of complex may have formed crystals on the surface of the glass which wasn't supposed to happen during our experiment for my second attempt I mixed glue and water in the one-to-one ratio also I waited they need it amount of routine you complex more precisely using brand new scales then I applied the same coating to the conducting glass with the help of the centrifuge then I dried the glass with a regular hairdryer it's worth noting that this method of drying turn out to be much better than leaving it to dry overnight we can see then when comparing these two plates when tonight with a hairdryer is a glue dries quicker and the layer doesn't spread thanks to the liquid surface tension as a result I managed to make four more plays with more or less even surfaces this time I have put the test display on the glass and place the second camera underneath in order to immediately see if this display works after applying a drop of liquid metal I'm touching the metallic drop with a negative electrode and tada we have faint glow we need to be very careful and not to accidentally toss all over a mist of layer is the electrode in order for the display not to short-circuit in order to touch the liquid metal more softly at my next attempts I use a graphite electrode instead of the copper one by the way gallium and indium a noise stick to is much better which is why it is more convenient to control such a display so display glows everything seems to work well however in some time below and disappears because as time passes or tinium complex falls apart which is why the efficiency of such a display worsens we can see that if liquid metal contacts with a recently applied a mr. Flair the glow neuron zooms but not for long satisfy the first LED displays were so short-lived because as time passed the organic molecules decayed which is why this place on blue faint and lose some colors node a scientist constantly improved such displays adding new layers improving efficiency of such devices in the end I decided to improve my display and enlarge it to do that I prepared some more emissive coating after that I stuck one of the mr. layers with a tape to the transparent print or film in order to call all the edges of the conducting glass then I spread a thin layer of the liquid metal and stuck the sandwich on the copper plate in order to make it more convenient to observe glory after connecting all the contacts and applied fire falls and the display starts blowing is mostly of note that this doesn't happen immediately rather with a delay Lord here isn't very bright and it quickly face because of the decay of the organic layer it looks more impressive in the dark and the fact that I made such a technologically advanced source of light at home makes me feel quite excited so in the end I think that you have learned the technology of making on a D display and if you like this video don't forget to give it a thumbs up and subscribe to my channel to see many more new and interesting [Music]

Channel: Thoisoi2 - Chemical Experiments!

Views: 190,140

Keywords: oled, DIY display, to make a display, organic LED, surprised, light source, LED, glue, chemical, organic chemistry, liquid metal, electrode, conducting film, material chemistry, ruthenium complex, chemistry experiments, channel Thoisoi

Id: Z4U_osIrY8M

Length: 10min 28sec (628 seconds)

Published: Sat Feb 15 2020