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  Figure 1  X-ray structure of the cationic Cu(I)-dinuclear structure of 1 with probability ellipsoids set to 30%

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  Figure 2  a) Absorption spectra of 1 together with free dpppy and dppm ligands recorded in dichloromethane solution, andb) Solid state UV-Vis diffuse reflectance spectrum of 1 measured at room temperature

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  Figure 3  Luminescence spectra of complex 1 in the solid state (λ_ex = 365 nm) at 298 and 77 K

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  Figure 4  Emission lifetime of complex 1 in solid state versus temperature

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  Figure 5  a) Luminescence spectra of 1 measured in powder, doping PMMA thin film (20 wt%), and CH₂Cl₂ solution, andb) measured in PMMA thin film with different doped weight (λ_ex = 365 nm) at room temperature

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  Table 1.  Selected Bond Lengths (Å) and Angles (º) of Complex 1

  Bond	Dist.		Bond	Dist.
  Cu(1)–P(1)	2.3172(15)		Cu(1)–P(3)	2.3122(14)
  Cu(1)–P(4)	2.3057(15)		Cu(1)–N(3)	2.027(5)
  Cu(2)–P(2)	2.2044(15)		Cu(2)–N(1)	2.031(5)
  Cu(2)–N(2)	2.034(5)		Cu(1)···Cu(2)	2.8739(9)
  Angle	(º)		Angle	(º)
  P(1)–Cu(1)–P(3) P(3)–Cu(1)–P(4) P(3)–Cu(1)–N(3) P(2)–Cu(2)–N(1) N(1)–Cu(2)–N(2)	114.03(5) 111.99(5) 98.93(14) 127.58(13) 103.10(19)		P(1)–Cu(1)–P(4) P(1)–Cu(1)–N(3) P(4)–Cu(1)–N(3) P(2)–Cu(2)–N(2)	123.26(5) 102.21(14) 101.58(14) 124.09(14)

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  Table 2.  Emission Properties of 1 in the Solid State at 298 and 77 K, and the Fitting Parameters Based on Eq. (1)

  Emission properties			Fitting parameters
  λmax (298 K) (nm)	488		ΔE(S1 – T1) (cm–1/eV)	812/0.10
  τ (298 K) (μs)	25.9		τT1 (μs)	130
  ΦPL (298K) (%)	57.3		τS1 (ns)	232
  λmax (77 K) (nm)	493
  τ (77 K) (μs)	130.1

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  Table 3.  Emission Properties of 1 in Different Environments at Ambient Temperature

  	λmax (nm)	ΦPL (%)
  Powders	488	57.3
  PMMA (10wt%)a	492	27.2
  PMMA (15wt%)a	494	33.4
  PMMA (20wt%)a	494	36.1
  CH2Cl2b	510	1.2
  a) Dopant concentrations in PMMA matrices are 10%, 15% and 20% weight, respectively b) The concentration in CH2CL2 solution is 1.0 × 10–5 mol/L

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