Korea Institute of Science and Technology

A Ra Hong

Seung Yong Lee

Ho Seong Jang

So Hye Cho

Joon Soo Han

Hyungduk Ko

Gumin Kang

Hyung Duk Ko

The present disclosure relates to down-shifting nanophosphors, a method for preparing the same, and a luminescent solar concentrator (LSC) using the same. The down-shifting nanophosphors according to an embodiment of the present disclosure include a core including NaYFnanocrystals doped with neodymium (Nd) and ytterbium (Yb), and further include a neodymium (Nd)-doped crystalline shell surrounding the core, or further include a NaYFcrystalline shell surrounding the crystalline shell. Therefore, the down-shifting nanophosphors efficiently absorb near infrared rays with a wavelength range of 700-900 nm and efficiently emit near infrared rays with a wavelength range of 950-1050 nm. In addition, the down-shifting nanophosphors according to an embodiment of the present disclosure has a size of 60 nm or less, and thus can be applied to manufacture transparent LSC films with ease and can realize transparent solar cell modules having high near infrared ray shifting efficiency.

Down-shifting nanophosphors, method for preparing the same, and luminescent solar concentrator using the same

Provided is a fluoride nanophosphor using, as cores, luminescent nanoparticles expressed by Chemical Formula 1.LiErLF:Tm&#x2003;&#x2003;[Chemical Formula 1] (In Chemical Formula 1, x is a real number satisfying 0&#x2264;x&#x2264;0.3, y is a real number satisfying 0&#x2264;y&#x2264;0.8 and is selected within a range satisfying 0&#x2264;x+y&#x2264;0.9, and L is any one selected from the group consisting of yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), ytterbium (Yb), lutetium (Lu), and a combination thereof.)

Core/multi-shell upconversion fluoride nanophosphor exhibiting luminescence under various excitation wavelengths, and method of synthesizing the same

Provided is a dye-sensitized upconversion nanophosphor including a core, a first shell surrounding at least part of the core, and an organic dye bonded to a surface of the nanophosphor which has an absorption band ranging from 650 nm to 850 nm and which is excited in a near-infrared region to emit visible light. The dye-sensitized upconversion nanophosphor may be included in a display apparatus, a fluorescent contrast agent, or an anti-counterfeiting code. The organic dye may be an IR-808 dye.

Dye-sensitized upconversion nanophosphor

Provided is a nanophosphor having a core/double shell structure, the nanophosphor including a upconversion core including a Yb, Ho, and Ceco-doped fluoride-based nanophosphor represented by Formula 1; a first shell surrounding at least a portion of the upconversion core, and comprising a Ndand Ybco-doped fluoride-based crystalline composition represented by Formula 2; and a second shell surrounding at least a portion of the first shell, and having paramagnetic properties represented by Formula 3.

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Seoul, South Korea

A Ra Hong