Green/Yellow solid-state lighting via radiative and nonradiative energy transfer involving colloidal semiconductor nanocrystals

Sedat Nizamoglu, Emre Sari, Jong Hyeob Baek, In Hwan Lee, Hilmi Volkan Demir

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


LEDs made of InxGa1-xN and (AlxGa 1-x1-yInyP suffer from significantly reduced quantum efficiency and luminous efficiency in the green/yellow spectral ranges. To address these problems, we present the design, growth, fabrication, hybridization, and characterization of proof-of-concept green/yellow hybrid LEDs that utilize radiative and nonradiative [Förster resonance energy transfer (FRET)] energy transfers in their colloidal semiconductor nanocrystals (NCs) integrated on near-UV LEDs. In our first NC-LED, we realize a color-converted LED that incorporate green-emitting CdSe/ZnS core/shell NCs (λ PL = 548 nm}) on near-UV InGaN/GaN LEDs (λEL = 379 nm). In our second NC-LED, we implement a color-converted FRET-enhanced LED. For that, we hybridize a custom-design assembly of cyan- and green-emitting CdSe/ZnS core/shell NCs (λPL= 490 and 548 nm) on near-UV LEDs. Using a proper mixture of differently sized NCs, we obtain a quantum efficiency enhancement of 9% by recycling trapped excitons via FRET. With FRET-NC-LEDs, we show that it is possible to obtain a luminous efficacy of 425 lm/W opt and a luminous efficiency of 94 lm/W, using near-UV LEDs with a 40 external quantum efficiency. Finally, we investigate FRET-converted light-emitting structures that use nonradiative energy transfer directly from epitaxial quantum wells to colloidal NCs. These proof-of-concept demonstrations show that FRET-based NC-LEDs hold promise for efficient solid-state lighting in green/yellow.

Original languageEnglish
Article number5170075
Pages (from-to)1163-1170
Number of pages8
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number4
Publication statusPublished - 2009
Externally publishedYes


  • F̈orster resonance energy transfer (FRET)
  • Green/yellow
  • InGaN/GaN
  • LEDs
  • Nanocrystals (NCs)
  • Nonradiative energy transfer

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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